Great piece over all. The mix of cool and warm values really makes both stand stand out well.
However, the top left corner looks a bit sloppy and incorrectly proportioned. The nose of the chimera is crooked, and the eyes and mouth are strangely slanted. Normally I would think that was on purpose, especially considering that these are chimeras...but considering the near perfect symmetry of the other two, the almost sloppy-ness of the chimera in the top corner truly stands out.
Besides that one face though...the piece truly is stunning. I love the blend of colors and the details worked into every aspect. Great job!!