Dr. Geep's is correct, this might be better off in the critique forum or the gallery, but since it showed up here why not comment.  I agree with CaptainJack1 on several points.  The lighting is off on the models.  Notice where the shadows fall in the background image and in your scene.  Completely opposite directions.

The plant material is out of it's element; it does not match the rest of the fauna and is completely out of proportion.  A shrub would have been a better choice. 

The lighting for this scene should be a bit subdued, not too intense.  But there is a fill light to the right which is, IMO, casting an unwanted highlight to the sole of the foot.  If you are looking for a little realism, it shouldn't either be there or the fill light aimed higher towards the face or faces.

I don't know whether you are striving for realism or strictly fantasy, but skin textures could benefit with enhance shading techniques which could be achieved by face_off's Realistic Skin Shaders or BagginsBill VSS Prop system.  It will be interesting to see more work on this.