where possible(hentai-foundry) sorted by date: newest first. Unsorted (other sources) pics at end.
Source:
http://www.hentai-foundry.com/pictures/user/DarkArtsKai
http://darkartskai.tumblr.com/

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Base +1, Junkie 2002 -6, VriskaSerket -30, animanera89 -7, HanakuroHakoniwa -12

Well, shit...saw a few characters I haven't seen recently...and there's a common theme with all three of them...see if you can guess it as I name off the characters in the order they appear...

Zessica Wong...from Aquarion Evol...

that was on page 53...I recognize her anywhere...
Then we had Lune Zoldark, from Super Robot Wars and Lord of Elemental...on page 78
...see the theme yet?

Well, this next on should give it away... Yoko Littner, on page 87...from Gurren Lagann...here's the theme, not only are all three of them mecha pilots from mecha anime...they all made appearances in Super Robot wars!!!

...Mr. Kai, (is it cool if I call you that?) ...you have good taste...

Base +6

The artstyle is amazing. Kinda reminds me of Dr Graevling.

Base +5

torrent plz

Base +6

I notice this one's slightly newer then the robobro set, not sure if there's much difference between the two.
I can understand why though, there seems to be a fair bit of hate for robo on this site.

Base +5

Hope someone had all his recent stuff. Guy followed the pixiv artist route and nuked all of his accounts. Shits gone

Base +6