I think the best place to loom for art challenges is the drawfee channel on YouTube. Some of my faves are the designing a character from a random description. Or you could look at the pokemon x Dnd or the character fusions. I've been thinking of doing some myself to try to get past art block.

I don't have any personal experience with Huion. with most tech its mostly down to what your familiar with, if your currently using Huion it should be fine. my past two tablets have been Xp-pen and I haven't had any issues with those.