I think that as far as landscaping goes, your scene looks good. I would offer that the Tiger depicted seems to be in overall gray, which by this time in the war, and on even a mid production vehicle would be incorrect ( we would be looking for dark yellow with some camo applied). I agree with Brian and his observation about the left track. Also the smoke grenade launchers on the turret left are mounted in the wrong place, they should be located at the top, with one leg of the bracket on the turret roof, by this stage of the war, they were non existent on the Tiger 1 anyway. The turret call sign numbers seem to be from a Tunisian Tiger, just from thier style and size.
Please don't be offended. I know that you have put many hours of serious work into this presentation. To most people who are ignorant of history, these things will go completely unnoticed. I feel that a diorama must tell a story, it is in fact an historical representation. So many dioramas are hurt by armored vehicles applied as an afterthought, sort of accessories like oil drums and gas cans, when really, as in your work, the Tiger is the eye catching focus of the piece. Proper research and attention to the details of history and equipment, will help you in the future projects to really hit home runs everytime.
It is very obvious to me that you are very talented and certainly can turn out work that is very convincing, artistic and well executed. Just by tweeking the details, you can springboard your natural talents into something very special. Congratualtions on a stunning presentation and all the best to you in the future,
Regards,
Steve