ok well i can see what you were going for.
the thing is not that the back round colors dont match because if you change the variations just a bit on your render it can actually flow, but he is not blended into the backround like he should be, things you can do to improve it are blend him into the backround, photo filters, variations, and smaller better font and text.
but not bad 7/10 because i kno wat u were going for