ooh, i love roy's smirky expression in the first one XD al's eyes are a little huge though. and i suck at drawing mechs too, but i think ed's automail is pretty fun to draw =3 good luck with the oC trial.....i've been experimenting in photoshop, trying to get the same effects, but i haven't got it right yet. i don't like doing things in one sitting either, because i had to do that for both this
picture (2:45) and this
picture (1:00) and it's a pain, because i never got to add the shadows to either. i tried uninstalling it and redLing the trial, but no cigar. portalgraphics, they're tricky ones.
oh yeah, for the ed picture, his hair shows a lot of movement but there isnt' really any in the clothes. based on how the wind's blowing, you'd probably want to make the jacket more fwappy in that direction (<--excellent artists terminology. fwappy. obviously i suck at describing things XD) and i think his whole pigtail should be shown blowing around, because just the end of it doesn't make as much sense.