I love the colours, and the textures in the background (reminds me of airbrushed graffiti). And also how you extended those circle designs inside the silhouette.
I don't know if I like the uniform outline on the silhouette though. I think it breaks the dynamic flow the the circle designs a bit because it's so uniform. I don't think it needs to be there. If you do want to have an outline, I think it'd be better to make it thicker and more dynamic-width (like in Kunie's art)