Thanks for the feedback you guys!
FoxWorthy - I'm actually going for a slightly more recent era Frog, so that explains the point on his head - but thanks for the suggestions about pupil size and mouth.
Muppetlab - the eyes are indeed 35mm - I am building a new head this weekend with a more flexible mouth (1.5mm rubber instead of the 3mm currently there - I'd initially thought the thinner rubber would be too floppy but the ultra suede and fleece should provide enough support I think.) Were you thinking that the whole head (including mouth) is a bit big? Or just the fleece portion? I'll scale the patterns back by 5-10%, I just need to know whether I need to scale mouth plate as well as fleece pattern!