Quite a nice one, especially since this is your first!

I see you're using vectors, lovely!
Don't forget to add your own little touch as well, I like the brushes used, but you could try and play around with those as well.
As for the main character, that of course, if marvellous ;]

I do have some critique on the way you used the white glow.
You used lots of white in the image, but somehow, it feels a bit "too light".
I would've just tried to give the character a black border, so you'd understand where he really is. It's just a detail, but if you want, give it a shot :]

You could also give the text a bit of a special touch.
White is your primary background colour, but the text isn't meant as background, it's meant to be the first thing one views, no?
I'd say, give it a border, or simply change its colour to make it stand out more.
It'll surely be better, when done right, though it might take you some experimenting.

At any rate, well done!
Keep it up! ;]

Nice one

Very nice for your first wall. Really liking the simplicity of this and the outer-glow around the white brushes. Also, the flower brushes used suits the image.