I agree This has a great 3D feel. The coulour is great and the image really stands out from the blurred background and the angle make it even more pronounced. Great work.
Ian :c)
You really have a great grasp on creating perspective.
This is solid work. 'Monolith' came to mind even before I saw your title. Which is most apt and fitting. And the image does have a haunting and forboding quality to it, great choice in colour palette.
One caveat though ... not sure where else you could have placed the moon(?), but, I am curious if changing it's placement into one of the upper corners would add to the height that you have created here and delineated the object a bit more. Hmm, perhaps you want to keep some of that mystery? If so, mission accomplished.