The only thing I don't like about ke-ta's work is how he draws the legs so skinny. The ankle could be slightly thicker as compared with the wrist, which will also mean making the rest of the leg thicker for balance. Still, this is well drawn as is already mentioned.
Are his books still nearly impossible to get? To be so generous on pixiv (and I sure am thankful for that) and so rare in prints, it's as if he was forbidden from making money.
Given how popular his work is I'd figure he'd go to each con prepared with as many copies of his books as he can have made and transport. All of that is still likely sold out in one day.
Ke-ta is one of those artists I feel really bad for getting his stuff off image boards for free. I would gladly pay alot of money for copies of works, especially his Fairy Drawers books. I'd be wary about importing his books though since alot of his stuff is very loli.