I'm guessing you're playing white since it's black's turn to move and the game ended with white making the last move. Please provide more info.
I like move 26. d6. It opens up an attack on the rook at a8.
I don't think 26. ... Re8 works, because after 27. Rxe8+ Bxe8 28. Qe2 threatens mate and gains a pawn by 29. dc
I played this game, pretty successfully, seeing as I won ( because of time, but still ), but I think my opponent would of destroyed me, had he had more time. I think my mistake was played within the last few moves.
Please, only analyse moves 21 to 26. Pay particular attention to the moves 21 and 26, as that is where I think were the most important endgame decisions were made. I play as black !!