The second image's logo has potential,however i don't think the background makes the whole too messy.
If you want my opinion: You won't find anyone willing to pay for such works here.
Either the users have a fine knowledge by theirselves thus don't need the images or who'd want them doesn't want to spend a cent.
I'd suggest you other forums instead.
Also,train alot on composing your images,except the 2nd sample's logo in the middle, everything else is not that great at all.