Great advice, JB123! I haven't made many morphs myself, so far, but what you write makes a lot of sense, and your results speak for themselves.

A tip I read for making expression morphs is to animate the morph and look at how the individual vertices move. You want them to move in a very smooth, coordinated way, as if you were deforming a rubber sheet, if you know what I mean. I think this is probably a good idea in general when making morphs that are meant to play well together, not just expression morphs.

By the way, did you find symmetry easy to achieve when making morphs with Blender?

-- I'm not mad at you, just Westphalian.