Hey looks good however i personally wouldnt have put the writing so big, just laid it out a little neater. What are you using to lay out/add writing? Im also not a huge fan of the scar it looks a bit messy.

As far as the background goes its completely up to you, do a background if you want (good environment practice) or if you want it simple just a gradient would do.

I know your only 11 so its an amazing job so far but keep working on it and it will be outstanding

Oh also there are a few spelling mistakes but i won't hold it against you! Give it a spell check.