The underlying drawing was fairly successful but the overall effect is a little too monochromatic, which gives a rather bleached-out look (although this photograph seems to have exacerbated it). More sensitive handling of the halftones would have been a good thing.
Predictably, the hair was a problem again. For one thing the hair on the cast itself is highly conceptualised and doesn't remotely resemble real hair. It's more like a jumble of pasta or something. The trick, I think, is basically to paint the shadows, rather than to paint the hair as such - but even then it's difficult to give it the same sculptural quality. With so much 'going on', visually, it's also incredibly hard to see individual shapes from a distance.
The rest of the cast was fairly plain sailing. The face is relatively simple since, being highly idealised, there isn't a lot of character to grapple with. The base was very simple, as was the phrygian cap. The only other thing I might do differently if I tackle this cast again, is to be a little more sensitive with the handling of the background, which could do with a little more variation and being somewhat lighter in value overall.