This is a good challenge.

I chose Harry Potter characters because a) it's fun and looks cute on Instagram; b) I wanted a theme, since the styles are all so different (though I think they mostly look like my art anyway), and Harry Potter (books, wizarding world, and fandom) is broad enough to allow for experimentation; and c) having a theme pushes me to look at the style, brushstrokes, and content of the featured artists and apply those techniques in a different way. 

I was more or less successful.