I totally agree with crofty ^^^ bring stuff a bit closer together and it will look better.
Just a tip i learned for blending.......

On the layer you have the pic of gordon on.....select the lasoo tool.Set feather to about 25-30px and draw a circle around gordon. Then go to Layer > Add layer mask > reveal selection.
It should help the pic blend into the background.

Anyway, nice work and if you keep at it you will get better