I don't think it's disrespectful. Especially since he's not even the one who started the thread. Does he even post here anymore?

Disrespectful would be bashing his figures without lending constructive criticism. 

I would welcome that sort of discussion in my own thread, as long as it stayed relatively on topic and provided an overall consensus of what people wanted in the figure(s). It helps to keep the thread alive and allows more people passing through to be aware of what is in development, etc. 

I like the most recent shots of the female compaired to the previous shots he posted. The eyes look better, even the overall shape of the face looks better.

 

~Shane