Row 2, pic 1 is fan art from an anime series called Higurashi. It’s…pretty damn weird. The two are twins. It’s not a catfight series, more of a supernatural mystery thing. Still, it is a damn good series as a whole. There’s a weapon based mixed fight in the…first season, I think? It’s been a while since I’ve seen it though.

Row 3 pic 1 is from an all female fighting game series called Arcana Heart. I am not a fan of Kira (top girl) nor Catherine (bottom girl), so I have no gripes with it. Now if it were my girls Lilica and Saki on the other hand…

If you like fighters, the 3rd (and best) game is on the ps3. It’s a digital download in the States though, no disc. Still, it is a very, very solid fighter, surprising considering the overall presentation of it. Sucks the series never did too well here, but that’s what happens when Street Fighter reigns supreme over all (if just cause that’s what most people know).

Last row, second pic is Tohou fan art. They’re bullet hell style shooters starring an all female cast, but I never really got into them.

Unfortunately, I don’t know the artists. Assuming you haven’t already, you could always check Danbooru and Gelbooru (most pics up here, I saw on one of those two…and 4chan >_>). They sometimes have links to artists (well, place artist tags in the pics with tags listed on the left side of the site, leading to pics with that artist tag) though, if you’re interested in that.