Thread:Bane7670/@comment-13055710-20150325204835/@comment-2000765-20150325220338

The illustration on the far left is TCW concept art, but the rest of it was fan-made. It even says on that link, "Dave Filoni's concept sketch of a resurrected Clone Trooper Echo (at left) alongside a fan imagining of of the finished animation by Brian Snook(at right)."

Therefore, that image is fan art.