Whilst I think Flippy is being a bit of a dick about it, I wouldn't say it was amazing. I'm not denying that it's okay, however I wouldn't even begin to think of paying for something like this. You need to work on shading and gradients a lot, because at the moment it just looks very unfinished and rushed.
I can see you've put some effort into it, however it's not really much compared to what other people on the site can do. Stick at it though, because I can see you have a talent!