A painting is a collection of a series of corrections.
It is in the contrast of light and dark that design happens.
The first thing you see is the last thing you do.
If it's all wrong, it's all right.
It's not what you paint. It's how you paint it. You don't have to paint elaborate things. Paint simple things as beautifully as you can.
You can't get it right, until you make it wrong.