I have been trying to sculpt 28mm for a while now using green stuff etc. but am now trying some polymer clay. I chose some bigger figures to begin, trolls, I think they are the biggest I've done thus far but are fun, around 60mm or so tall. Far from finished but thought I'd share.
One is baked and the detail work in green stuff is started. I'll do hands, clothing, chain, etc. in putty work but the polymer is nice to rough out the figures first.