Thank you very much for your comment :)
Morphing is done by hand and the judgement depends on how close the element you have selected is to the requested element in the succession of frames that make up the morph. I don't know if I'm making myself clear, so I drew you a picture :D
In this example, you need the big smiling mouth. Getting it earns 6 points, the two nearest frames earn 3 points, those after them earn 1 point, and the rest earn no points.
The overall score is calculated by repeating the same operation for each element and adding up the results.