I have a tip for sculpting with greenstuff.
Use petroleum jelly (Or Carmex, either way). This helps the smoothing process tremendously. You won't even believe how well it works until you try it yourself.
Your paintjob on the Daemonhost is quite fantastic, really. Any suggestions here would simply be a matter of taste. The only thing that could really use some work is the rust. If you use GW paints (or an equivalent), I made a rusting tutorial on the Warhammer40k forums. The pictures aren't the best quality, but it still gives you a good idea of how to go about painting some extremely realistic rust.
You can find that here: http://www.warhammer40k.com/40k/viewtop ... db2af06168
28-32mm scale Silent Hill figures
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