Wow -- wow! Stunning piece! I think the crop has worked magnificently, the rocks really do dwarf the little warbler. I think this is my favourite Keeble!
That sorts the forehead just nicely. All lines (even ones in 3-d) are affected by others in proximity. The chin area is the next to be assessed I think. This will have an influence on how the brow looks too. Very nice - is Mr K sen/ assisting still or have you been abandoned?
So the current plan is to give the chin quite a full convex shape (hopefully not quite like a swift carrying a food ball, but in that form) and then rely on the painting to break it up and fluffify it.
. . . had a drink this evening.