OK, NOW I think my updated ref sheet for Pearl is done!

FYI: there is no exact amount of horns for her back or tail. The only ones that should be exact are her face horns (5 down the middle from nose tip to the top of the head), the 2 on each side of the brow, and 3 on the cheek. x3

Also there is no exact number of tail feathers or wing feathers either, since she sheds them to grow new ones sometimes when they get worn/torn. x3

As for her triangular/diamond pattern down her back, there is a diamond shape between each horn. So even if you have less horns on her than are in her ref, just make sure the diamond pattern idea stays the same!