I started to use raw squigs.
Would it be possible to calculate a score how close you actually are to the original. How precise you draw. The "OCR" could maybe already have a usable value for this maybe.
Output could be via those "encouraging comments".
And maybe as a longterm value you can track in progress.
Nothing really urgent, not sure it would work that well.
I can only recommend to try raw squigs (checkbox in right corner in settings). I dismissed it earlier, but if you try for a while you realize how much Skritter actually helps and gives away by arranging the input. Standard Skritter helps to remember characters faster and reading, so passive knowledge but that alone won't let you write them.