Second Cast Painting -- Dry Brush Stage

Two years ago, I drew a cartoon of this cast for a charcoal cast drawing (bottom of photo). I've returned to it for a second cast painting. I transferred the drawing to linen that had already been given a ground of gesso. The easel used to be on the left, but now it's on the right. This has created some changes in shadows and shapes, even though the light is similar and the statue at the same level and position as before. So I find myself redrawing the image in dry brush, taking longer than I'd hoped.

The source of the sculpture is unclear. I've heard it called both Moses and the Gaul (from l'arc de triomphe in Paris)...