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Before I say anything, I gotta say HOLY SHIT. You need to work on HANDS? LOL your hands already look flawless my dear, they are simply amazing! If you find them difficult, then it's hard to know because the way you draw them makes it look like you know exactly what you're doing and like you've mastered the art of drawing hands ages ago lol I'm just REALLY impressed with your ability to draw hands so flawlessly, VERY impressed.
Honestly? I can't think of any crits to throw in here. Your art is wonderful. You have a more oldschool video game style as opposed to just pure anime, you look like you know what your doing with proportions and anatomy. You can draw motherfucking GUNS, fabulous attention to detail and design, you can draw folding in clothes, shit. I REALLY like your art

About the only think I can suggest, if you don't or haven't yet, design a couple really old people LOL. Seriously. Especially a bony one, because it will force you to dive into knowledge of the bone structure of the face which will help you in the longrun with characters and customizing each one's face. Now I'm not saying you fall victim to this, I haven't seen enough of your art to be able to, I just know myself and many others that have- I just find with a more anime-esque style it's too easy to draw characters that almost all have the same looking face lol.