Overgrown Colossus Concept Art

Personally I am anything but an artist, but I know good art when I see it. I usually browse deviant art looking for images that I can really appreciate, and usually that art comes from experience. I recently played SotC which is how I came across this and I will tell you this, it really grabbed my attention. I think that this has a lot if detail and effort put into it and it does an excellent job of showing subtle opposites. The colossi are extremely different in color, appearance and size. However the similarities are quite notable being they are almost the same creature, and both are plant like in origin. I appreciate if you took the time to read this and I would like to thank you in advance for reading my critique. (It is my first one after all). And the only thing I have left or say is... I really hope that you got a good mark for this.