Hey spidey ,
I looked through your work here . You showed some good stuff with good points , i liked your redesign of Captain America the best . You also showed some of the same problems over and over .
Only my opinion , don't have to take any of my advice but......
What i would start working on is the shoulder location on the body . Seen it over and over in each pic your putting them out to far from the neck and chest and it's putting off the whole figure . Try doing some relaxed figures with arms just hanging and bring those shoulders in about one shoulder width, then under the arms is gonna come in abit also .
I think it would improve your work right away .
hope that helps ya out .