One thing you could do is, I'm guessing those pawns are raptors, you could use those as rooks so they're not taller than the king. Then use dinosaur eggs as the pawn.
As for price a collector of chess sets could probably place a value on it. Being handmade and limited production it may or may not be pricey.
Hi thanks for the comment! I really like the idea of using hatching dinosaur eggs as the pawn pieces I just wish I'd have thought of it sooner ha! I did try and keep the sculpt of the raptor busts smaller and on a lower profile plynth to make them lower than the pieces behind- or are you saying that the king piece should be the tallest piece?
There's nothing wrong with having tall rooks. Piece heights were big in Germanic countries with some designers drawing a line down the set King, Queen, Bishop, Knight, Rook, Pawn and making them geometrically smaller as they go, but even them at the same time would sometimes make an ornamental rook with a flag on it that surpassed the height of the King. Knights have sometimes been the tallest piece as well which makes sense as a horseback thing. Part of the modern Staunton set is these piece heights, not quite as mathmatical in their proportions as some of the old German ones, but KQBNRP in that order, although even some Jaques sets have Knights a little taller than Bishops. What I look for in a unique design such as this, instead, personally, is that the piece signatures are clear and recognizable, and I'm not sure they are here. I kind of see where you are going with the Bishops having a crest, but then what makes the Knight look like a Knight? (all the pieces "look like Knights") so it's a challenge. I think the egg idea for a pawn is a good one. I also like sound67's idea of the Triceratops as the rook, particularly if you want to go with standard piece heights, but I think the rooks as you have can work already, though some of your other pieces seem less clear. .. that said one other thing about tall thin pieces is they can be associated with Bishops. Now maybe what you've got is what you've got and you will not find dinosaurs unique and different enough to make clear chess piece signatures, but it's just my 2 cents on what I look for. I can't speak to your real question about the marketability of this set. I used to be a bit active in one of the chess collecting circles but we were never very interested in this kind of thing. CCI people might be but I was never a member. My guess is this kind of thing would be more of a gift/novelty item not precisely aimed at chess collectors or players. Just a guess.
Here's an article about the Staunton design by Alan Dewey: http://www.chessspy.com/articles/Staunton%20Chess%20Set%20Design.pdf bottom of page 3 you can in the Edel drawing what I was talking about with the piece heights, but then bottom of 5 already you can see a real Jaques set and the rook happens to be taller than the Knight (not what I said about the Bishop vs. Knight but you can see these things sometimes happened.) It's too bad I took down my chess collecting website, but here's the first Barleycorn set I found with tall rooks. 
If they're not, in fact, taller than the Kings here, believe me on some sets they have been, and looking at this set perhaps you can imagine it.
Another thing you could do with the rooks is Volcanoes.
Wow thanks for your constructive input to the set, some great ideas here! My initial plan was to have the triceratops as the rook piece as sound67 has mentioned with the dinosaur having that sort of sturdy feel about it, and the brachiosaurus was intended to be the queen, however I spent quite a bit of time on the triceratops and it ended up being a much more impressive sculpt in my eyes, and I felt therefore that it would be better placed as the queen- also having a crest which could be seen as being akin to a crown.
tmkroll I realise it is not to clear in the image above however on the plynth at the base of each sculpt there is a plaque with the symbol for the piece it is representing- thuis was my way of getting around trying to make it clear which piece is which in the set. I just took this image it shows some pieces a little closer up.
Thanks for the response. I don't like that idea. IMO the pictures of Staunton pieces you have there don't really go with the rest of the design of the set. Also it's my feeling that if you need a "key" to see which piece is which than the design has failed in an important way to begin with, but other you're not the first to do it. You have used a solution to the problem that has been used successfully and professionally before and my opinion is just my opinion. My opinions on that stuff aside the set does look quite nice.
I would like a dinosaur chess set with herbivores on one side and carnivores on the other side.
My idea for a dinosaur chess set (Herbivores VS Carnivores)
Herbivores (White army):
Stegoceras as the Pawn
Euoplocephalus as the Rook
Tsintaosaurus as the Knight
Triceratops as the Bishop
Wuerhosaurus as the Queen
Stegosaurus as the King
Carnivores (Black army):
Velociraptor as the Pawn
Alioramus as the Rook
Spinosaurus as the Knight
Yangchuanosaurus as the Bishop
Giganotosaurus as the Queen
Tyrannosaurus Rex as the King
Hi, I'm new here and I'm not sure if it's the right place to post something like this. I've been dabbling in various creative projects and over the past few months I've made something I've always wanted to do- a chess set- this one being based around dinosaur busts sculpted from epoxy clay and cast in lead free pewter.
I have the capability to put this into production- what I'm looking for here is whether you guys think there may be some niche market out there for something like this- as I'd love to make some and get them out there. If you have any feedback on what you think of the board that would be greatly appreciated. Also, if you could give me an idea of what sort of price you think people might pay this would be brilliant and really helpful. I've included an image below of an overall image of the set.
Again, I'm not sure if I'm posting in the wrong place here and will happily take the post down if required.
Thanks for taking the time to view the thread,
Martyn