Learning how to paint tree branches should not scare you, because it is fairly simple if you follow a few simple rules
Trees that lose their leaves each year are called deciduous. They offer amazing opportunities for the landscape artist. Painting tree branches, limbs and leaves of deciduous trees is fun but may be a bit challenging if you do not practice a few simple artistic suggestions.
First, know that most trees do not grow perfectly straight upwards. Let your brush, bend and twist slightly as you work in up and out motions. Also be careful not to paint all of your trees exactly alike. This is sometimes difficult, because when you find a technique that looks realistic, it's hard to vary it. Choose the color that you use for the trunk, branches and limbs carefully. The tree may be more gray than brown. If it does take on a brown appearance, you should add some purple to darken it or white to lighten it. Just try to stay away from using just brown when painting trees.
Start with the bottom portion of the trunk. Notice how most tree trunks flare out as the roots spread into the ground. Pull the brush upwards and branch off as your work. Get a good skeleton of branches and limbs. Make sure that some of the branches overlap others. The branches and limbs should become smaller and they grow out and away from the trunk.
When and if you add foliage, try to remember that you are not painting leaves. If you think, clusters of color, you may get better results. Dab clusters of color where you want leaves to be. Do not cover the entire space. The tree will look much more realistic if you leave some empty or negative space. When painting leaves, remember less is more. Follow this rule, dab, step back and view, dab, step back and view. Repeat this until you are satisfied. The colors you will use depend on the time of year. Use greens in the summer and oranges and reds in the fall.
If you have never painted trees before, you will need to practice. I recommend that you purchase a tutorial and follow the directions of someone that is laying it out step by step. Like many aspects of painting, you probably will need to practice painting a few trees before getting them just right.