I think that you should use photoshop for stuff like that (and everything else xD). But yea, a lil' more definition and a background color other than white would make it look better ^^
no offence, but you cant really tell what it is, you need to add some more stuff to it and as someone said before give it more definition
I really love the first one in your second group but as everyone else has said. add, add, add. These can only get better now
I think it looks cool. But then as I am utterly useless and am unable to do any graphics (probably would help if I bought a graphics programme), my opinion might not count. Think it's pretty nifty though. 8)