For the past month I've been fooling with a Wacom Mobile Studio. I'd dithered on whether or not I was going to keep it (it's heavy! and really needs a kickstand! but unlike the Surface 4 it works with Illustrator!); the return window ran out this week, so I guess that's decided.
So I drew the watery genie that hangs out in my computers and helps me draw, all dressed up in this device. (Actually this is the second time I've done this for the Mobile Studio; I didn't like the first one so I did it again.)
That thing floating next to her head is a Twiddler chording keyboard, which I'm using to do keyboard shortcuts. It's a crucial component of making "serious pro art tools on a tablet" work, IMHO.
Drawn entirely on the Mobile Studio, using the Twiddler for pretty much all keyboard shortcuts and layer naming, in about 2.5h.