Spent a lot of time in MS Paint and GIMP drawing those cutie marks. Tried to get them to look like the real things. Used refs and made copies by eyeballing the references. I felt it was more satisfying than just copy-pasting refs over.
Anyway, this was fun to do, especially getting those cutie marks to look good using the MS Paint curvy line tool and doing any rotations in GIMP.
Enjoy!