Dayum, what were you talking about with wow factor in painting. Being able to do that with something that can't be erased or painted over is much more impressive. And all those details...
For visualizing without lines, I just toss color in, redefine the edge, then add details. Here's what it looks like before I use a hard brush:
Many people prefer to paint over lineart or sketch, especially with more detailed paintings, so you don't necessarily have to work without lines.
Unfortunately, every artists I know said the same thing, you will never be completely pleased with your work. Just have to learn to be happy with what you have while striving for the better, I guess. It's the same for everything, really. You should chase perfection to improve, but at the same time be aware that you will never reach it. You can talk to professional artists to see how they cope with it. I just do it as a hobby, so it's easier for me to accept it.