Effects are sweet for sure. But here this is wat u gotta do. Blend! There is no blending at all in this picture maybe the black boarder if u count it. Green background with a yellowish character with blue texts. You need to have a focal point but also have a blendin color with background to your stock image. The text needs to show out but also blend with these.
Awesome start for a first sig just work on blending hit some tuts then try again and ill see wat i can tell u from there.