Looks fantastic. Can't really fault your technique, she's a beauty! Love all that detailing....
One thing, which isn't really a suggestion actually, more of an observation. In dioramas I like to introduce a human element, which can also provide a sense of size, especially for SF subjects that are sometimes hard for someone unfamiliar with the subject to grasp.... like a helmet with a bullet hole or something, hehe... anyway just an observation really.
Anyway, great work!
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