That's a lot of artwork in one post and I'll try my best at giving you a helpful critique, but let me get this out of the way first: I really enjoy looking at your stuff. You know your Capcom characters very well and it's pretty obvious that Bengus, Edayan, Ikeno and all that gang have influenced your work. If you don't know who these people are, do yourself a favor and get the Eternal Challenge artbook. You'll enjoy it a great deal, though I'm pretty sure you must have it already.
With that out of the way, let's start with the stuff I like.
The poses Cammy and Ibuki are in are fairly complicated and you pulled them off pretty succesfully, especially Ibuki with all that foreshortening. Complicated poses are always challenging and it's good that you're not trying to avoid them. Dudley is easily one of my favorites out of everything you've posted, despite the fact that you said you don't really like it. Drawing characters in every day situations is very SNK-ish and you pulled that off really well with him. I would've probably given him sunglasses (because Dudley is cool like that), but that's just me.
Your coloring is good, really good. Not so much with Elena (but that was done rather quickly I assume) but Ibuki and Dudley look really good. You've got a good sense of where shadows and highlights go and you're using colors in really interesting ways (like how Ibuki's shadows are some kind of pale-ish blue) and that is somethig I'll think about when doing my own stuff. My only complaint in that aspect, is that these drawings could use a bit more contrast, but that might not be what you're giong for.
As far as actual critique goes, well, my biggest problem (and the drawing I like the least from this batch) is Vega. His pelvis is bigger than his shoulders even with slight foreshortening and it just looks off. He is also shorter than he should be and his left arm looks weird anatomically speaking. I'd say you just didn't spend enough time in pulling that drawing together and I'm sure something looks odd to you as well. Elena is kinda "meh" too but, as I said, I'm assuming it was a quick sketch rather than a more completed piece.
Cammy, even though how I mentioned how I liked the pose, looks off as well. I had a hard time pinpointed the problem, but I think it's because her butt and pelvis are higher than they should be. If look at only her head, arms and shoulders, ignoring the rest of her body, it looks like a straight on pose, which means that her pelvis should be mostly covered by her head. I don't know if I'm explaining myself well here, but if you trace where her left arm hits the ground and where her knees would be hitting the ground, you can see that the distance between those two is larger than the distance between her head and her butt and it should be almost the same. I think the best way to fix this without discarding that pose is to give her arms more foreshortening, at least her left one, which is the one that is acting as support and should be hitting the ground fairly vertically.
As for more general stuff, I'd say that you could benefit from grabbing an anatomy book and studying it like hell. That's one of the biggest issues people like you and me have and the Cammy and Vega issues I mentioned might've been avoided with a better knowledge of the human body. Also, even though I praised it to no end, I think you shouldn't start coloring yet. I always mention how wrong I think it is when people start coloring when their pencil/line work isn't up to snuff and this is no different. I'm not saying your line work is bad (it's pretty good actually) but just like me or anybody else, it could always be better and there are noticeable areas for improvement.
Those are my two cents.
I hope I didn't bore you to tears.