You should've blurred/smudged the edges of his hair, because the render cut off part of his hair and it's the only thing I'm noticing and it's really bothering me x). Other than that it's good.
Just blur out around the render or brush it with a black color to create some depth and a focal, also too, I see you used a splatter brush color yellow, you could instead of doing that could create a clipping mask it will look so much better.