In all actuality Artistic talent or skill isn't defined by detail, perspective, or form. But a combination of many different things. Now when you have a pile of detail on something like a comic, it tends to be more annoying because it resembles something more like a painting. Detail in a picture, or painting is one thing. But when it's in a comic, the image can easily become too busy just by having too much detail.
Now as for perspective in the sense of background and foreground making the most sense. In and of itself. Some artists will draw the background as blurry so as to not subtract from what's actually going on, while others will just have a simple, or soft background to do the same thing. But, like I said, when you have alot of detail in the background, it subtracts from what's going on in the comic.
As for form. The ability to form a hand, draw a face, and to do hair is somewhat needed. When something looks odd, or lumpy when it shouldn't be. Makes the comic less good simply because most people prefer to see something that they view as realistic. Would you read a comic when the head is overly lumpy, or the hands look like deformed flippers when the person that is draw isn't supposed to be deformed?
Now you ignored something important in art. Shadows, and shading. The things that actually add depth into an image, to make something flat look like it isn't. In a comic, it isn't really needed, but in a picture, or painting of say... A tree. It is needed just to give it depth.
