I'll bite. So can you provide some comic book or tshirt or albums or graphics that you admire or aspire to achieve? Doesn't have to be all actually, we can start with the comic book style you love or aspire too, and use it as a style guide to start the discussion of critique.
And maybe not who is your favorite comic artist you want to copy cause you dont want to do that, but which style have you seen or you know of that makes you want to learn how or what they know that you don't by relating it to your work.
The reason being is art is so relative to what you the aspiring artist wants to learn that makes a critique rather difficult and also special. Because I am not (and no one else is) the authority on what is the "right way" is. So what makes it special is learning in discussion what it is that you need to, or want to learn.
Also what program and equipment are you using will help in knowing what limitations or not you may have equipment wise?