I don't know if I have the right to suggest this, but I'd like to comment on the style of a lot of your pieces.
I'd like to see some more color variation in your works. You have such a great understanding of color interaction, but you always seem to use the same basic pallette. A lot of your pieces have these same colors: dark teal, peach, light lavender, a red->orange->yellow color row, and a dark reddish brown. As a result, though all the pieces look great by themselves, they tend to look the same. Perhaps it's because many of them were from that GBA game you're working on? If this is true and you wanted to keep the same style for the entire game, then I beg your pardon. But if not, try working with some new, interesting pallettes. I'd love to see what you can do.