Lemme get the important one out of the way first:
I will never again be accepting and doing commissions for anyone so just don't ask and save yourself trouble.
Now, on Art Trades. While I generally only do this exclusively with friends and rarely at that (read: Almost never), I COULD be convinced to get into one with someone. Odds are though that I won't because I don't like others drawing my characters anyway and I'm terrible at asking people to draw something else for me.
So best bet, save yourself rejection and don't ask me for either. :P
I do randomly give out free requests, so might want to keep an eye out on that maybe.