First one is good...a little confusing to the eye but thats just due to similar colors being used in the render as well as the effects. I would of placed the pentooling (lines) a little further back along the front wheel, perhaps flowing around the front fascia of the bike...kind of give it more of a 'flow' other than that...perhaps the large purple area to the left (C4D Im guessing) seems out of place...I think removing that would show off the render/depth better. The second one, I like...a lot...only thing to really say is the pentooling looks a touch too sharp...other than that. I like it...simple yet creative and I think it was executed very well.
Thank you. ^_^ I'll definitely take your advice into consideration when I fix them up later. But I added in the pink C4D on the Peach one because I didn't want it to seem too boring. But I'll remove it and add some pen tooling in that area and fix the pen tooling on the right to get it more flow.
oh, a sprite sig. I see what you did there. all joking aside, I like the artwork on it. the text could use some work though. I'm kind of a "solid text" man. :\