nice idea... but try to work on the lighting author... the gal has the sharp highlight and shadows, while the forest isnt showing any signs of light in tht direction... even the lighting on the bunnies contradict the lighting with gal....

also try to check the proportions and scaling of bunnies and gal author as it is the one which shows the distance of the obectsj from camera and also the real size of the objects...
not tht i am gr8 at it, but i feel the bunnies can be smaller in size....

and once lit well you can add shadows to appreciate the lighting... and there is always the scaope for improvement...

hope my suggestions is of any help to you....

Completely agree with closedeyes

Too dark, and the edges around the bunnies show too many stray pixels and are too sharp, giving them a definite "'cut and paste" effect.

Lots of shadowless bunnies in this one...
Man if you need help with shadows & stuff send a PM to the commenters ( the ones before me) they will help you.