I've been trying to do some work on Mystery Project X every day. And nearly every day I hit some problem on which I bang and bang and bang and bang and eventually pound through. I've heard it said that if it's not hard, you're not stretching yourself enough. I'm stretched.
The problem usually isn't drawing, it's storytelling--controlling the pace of the story through the panels and deciding what information needs to be in each panel to not only depict that moment of action but pay off the previous one and set up the next.
I could write a really long post on this topic someday. Not today. But here's a fundamental truth about making comics I didn't understand when I was young: a lot of people can draw one pretty picture that'll take your breath away. Literally millions of artists can draw prettier, more impressive pictures than I can.
The trick--what makes what I'm trying to do comics rather than illustration--is drawing the pictures before and after that one to convey information, create a mood, evoke an emotion. The choices you make define your voice. They can't all be technical showstoppers, any more than every violin recital can be "Flight of the Bumblebee." Sometimes the very best comics panel is one that shows very little. Sometimes the most perfect thing you can draw is nothing at all.
It's really hard.