as a begginer, its pretty kewl

but when u look at it, it does seem somewhat basic.
have a go at using the adjustment layers to work on colouring for a bit.....that way u will be able to get the colours from the BG and the render to fit together a little better.

also, take a look at some tutorials.
there are tonnes out there that will teach u some more teachniques and as u gradually improve, u will be able to use more complex techniques to achieve amazing outcomes