The Marshall Gambit

I have for years played the Queen's Gambit. It's not really a gambit in the sense of giving up material for long term positional advantages so I'm not really a gambit player. But when I have the chance to play the Marshall Gambit, I will. This is a line in the queen's gambit declined after 1. d4 d5 2. c4 c6 3. Nc3 e6 4. e4. White gambits a pawn in order to get much better development.

Working on playing with dynamic advantages like a lead in development is something I need to work on. So here is a game where I failed to fully utilize the advantage:

I have a second example in the Marshall Gambit where again I don't find the right way to make the best use of my forces. Without further ado: