Just wanted to add an update on wear and tear, especially as Sarah is considering what to use on Jules.

Originally, I used acrylic inks on Monty, and then added a layer of inks and latex mixed over the top as the latex mask paint had more movement. After a few weeks running, the paint surface is holding up quite well, though I have noticed there are a couple of areas where an ink-only layer has cracked and pulled away from the surface right next to the latex layer. As in next to the (mainly latex paint) yellow stripe here:
But overall, the head has stood up quite well to wear and tear, and in my experience it's the head that gets the most knocks. Especially with a herd of them!

The Boa Pleo is still unfinished, I got tied up with work stuff recently, but at least it's given me an opportunity to check out the latex paint wear before I finish him. The latex mask paint does feel a lot softer and smoother to the touch, but I wondered how it would last, and as you can see it hasn't held up to the surface knocks as well as the predominantly acrylic ink paint layers on Monty:
So, it does seem, at the moment, that a mixture of the two paints will give the best results. I'll redo or touch up with a 50/50 mixture and see how that lasts.