BMW have 2 design proposals for X6: one very close to this Huckfeldt's impression (more SUVish), and another one (more Coupe-ish).
The BMW board of management have chosen the more Coupe-ish variant.
So this X6 by Huckfeldt is not the chosen one. The chosen one is more similar to the red CGI from Auto-motor-und-sport.
X3 is spot on.
X5 - front is spot on, but side & rear more chunky - not so rounded like Huckfeldt has portraited it. Rear & side are more like the AZ CGI:
