tags would be good enough for that, but it's often mistagged or not tagged enough...

like if i want to see 32px tiles... there's 32x, there's 32x32, there 32x64, etc...

charsets isn't tagged (or lots aren't)... and i'll need to know the number of direction (rpg maker vx had only 3 if i remember well), the order of them (it varies), knowing if it's only static char or if there's movement animations, etc...

I almost think users  should put a minimum number of (good) tag per submission, possibly reviewed.