Personally, I don't see these as great due to head shape being unusual and scaling with body not normal. Some pieces like the green dragon head and the face have some creepy issues, specifically the mouth of both.
The green dragon's mouth needs shaping to fit the simulated head shape while the face mouth needs to be moved upwards and elongated (a bit) and the nose shortened. Also, doing without lips (as I found in my case) tends to make the mouth less disproportionate and unusual compared to the rest of the face.
I can't do as well as this, though. Keep up the work.