It's actually a photograph of a plastic Gundam figurine. No, really. It is.
Back in 2012, Kotaku profiled a Gundam statue with an anime-inspired custom paint job. That one was made by modeller mumumuno53, and so was this latest effort. But honestly, this time mumumuno53 has really topped that earlier effort.
Check it out for yourself.
This is the Gundam model as it was being painted.
And the finished result:
It really looks like cel animation.
You can see more pictures on mumumuno53's site in the link below.