Detailed still life drawing

There wasn't much thought in composition during the setup of the scene for this drawing - I wanted to have a transparent object in front of a more complex object so that there are more interesting reflections and refractions and I wanted to have a smooth sphere-like object so that there are some smooth gradients in the drawing.
What I don't like about this drawing is the way the grass imitation on the middle object turned out. What I like however, is everything about the dog (both shape and shading). The gradient on the ball seems to work well also.
It's nice that quite a lot of refraction is going on in the bottom part of the first object and that there are some interesting environment reflections on the right side of the third object. Also, at tho top of the perfume there is  a line with some refraction showing the dog from the object behind.