For clarification purposes, I’m talking about blending, meaning smoothing your paint on your canvas, not blending two or more colors together.
Okay, this is a bad habit a lot of artists, including myself have. But we need to stop the blending madness. Have you ever seen where you have a ring of paint around an area and nothing in the center? Well, so have I and it’s because we blending too much.
Here are two ultramarine blue spots.
For the spot on the left, I blended for a long time very aggressively concentrating on the center. You can see that I've removed most of the paint from that area so that there's a ring around the edges. Trust me when I say I've seen spots come out way worse than this.
On the other hand, for the spot on the right, I blended for a short amount of time, very gently; I kept my wrist loose, and concentrated on the edges.
As you can see, it’s far from perfectly smooth, but that smoothness would be much better achieved by adding another layer or two, after the first layer is dry of course, than painting one layer and blending it to death.
You can see this in action in the video below.
Painter of portraits and wildlife