Your bushes looking like a mudslide?
push the brush slightly into the canvas. With a lot of paint loaded in the brush to a dog paw ( a rounded edge ) with some Amazing White medium. And he is barely putting that brush to the canvas. Another common reason for getting mud is getting the paint to thin adding to much Amazing White medium. You only want the paint to have a little pull to it. So when adding Amazing White medium just add a little at a time until the paint becomes creamy not thin you should feel a little pull when loading the brush. Another common reason for a "mudslide" is using your wrist to push the brush into the canvas this causes your brush to move up and will make a smear or a "mudslide" remember to keep the brush firm and loaded with a lot of paint. Most beginners load their brushes with very little paint not wanting to waste it because it cost so much. But remember your paint will work for you as long as you use it! So add some paint to your palette and get MONKEY FACED ON IT!!