heres my tip:
-first, do this:
>>68395 till you pin down a style for faces you are comfortable drawing.
be it anatomicaly/show acurate or even your own style. after you got a face style, you can work the rest of the body from there.
-practice an anatomy style that is likeable to the eye, not just easy to draw.
-before jumping to colors or shading pin down a lineart style.
its better that way, it will also take less time to improve like that.
-pay attention to how other artist make their pics.
if you talking about a one stand comic whit 5+ panels, dont go all out whit it, draw losely and have fun whit it. (depending on the type of comic) people wont be paying that much attention to individual panels.
if you are talking about a 3+ pages comic, dont do it yet. work out an style first.
for traditional drawing, get a kneaded-eraser to lighten your pencil sketches and a fine-point sharpie to ink them.