Belle

So, my own little advice (even though I don't pretend I know anything better).

You clearly know how to built a scene. You have all the elements and they are perfect together in this scene.
Now, the two major issues that I see are: the cropping and the lightning.

Your cropping could be a little better I think. You have potential and I'm sure you can do better and smoother cuting out. You can check this for example [link]
I don't know what programme you use (Photoshop?) but I explain here how to cut out properly with a mouse.

The second thing, and it's probably the most important in a photomanip: the lightning: your elements are displayed together but with no work on the lightening or shadows. So I think you should work on that a little: darken what is too bright, make some shadows, etc.
(But maybe it's just a problem of knowledge of your programme, if you don't really know how to use all the options?)

I think that with those two elements worked out, your manip could definitelly look awesome!