GREAT WORK!!! This was exactly what I was planning for a custom giant commission I am working on right now!
My only comment; other than how OUTSTANDING this custom is; would be this.
When Snake Face comes out, I would recommend getting one extra just for a set of biceps to extend that magma look down the arm just a tiny bit further, to help give that look of the transitioning body as you did on the legs.
Otherwise, AMAZING work! You attention to detail is mind blowing! I am now looking forward to seeing more of your work!