Suggestions for better pawn promotion endgame

Looking for thoughts on how this game could have been played better.  I know there are mistakes made early on, but the play that I am interested in is after the knights are traded away around move 38.  Thoughts are appreciated for both white and black.

Suggestions for better pawn promotion endgame: (16) Nf5, may have been another option.

Thanks- I made the same point in the annotation.  My question was more about the endgame. I was wondering about thoughts on how play could be improved after the knight trade after move 38?

Was there a place where black could have made a better stand, or was there limited options after the knight trade?

If no one posts ill just review the gave via computer analysis. 

The move by black that really stands out to me is 42... KF5.  I think KE5 by black (intending to follow up with KD4, intending to maintain the passed C Pawn (which is the most dangerous pawn on the board) gives black the best chance.