I would agree with some of the downward angle comments Brea made. Its really predominant on the Female!Thor photo, if her arms were a bit over to one side you could see down her shirt and thats not cool/not flattering.
I commend you on trying the unique angle, and I like the composition of photo 2599. I feel like some of your photos could be lightened up either during shooting or in post process because sometimes detail is lost in them (looking at you photo 610 + 525), also indoors you have some color casts going on, another thing you could try to correct in PS or by shooting in daylight or adjusting White Balance.
Zero (Drakengard 3)
Kiss-Shot Acerola Orion Heart Under Blade (Kizumonogatari)
Sakura Saber (Fate/Koha-Ace)