Quite a nice, well-sized set you got there, mang.
A few crits: Use less (or no) black. Increase the contrast and maybe add a specular hilight. And the crying face looks more like it has a blue beard. The steamy-headed one looks more like it's forcefully grinning...unless thats what it's doing.
All-in-all, nice for an emoticon set.
Do I spy the Graal noob?