Reinhard, the trees are impossible to "duplicate", so that is where the "art" comes into play... just trying to make a reasonable representation.
Koos, here is a tutorial...
First, it helps to have photos of real trees handy. If you can photoshop them to the actual size neededfor the backdrop, so much the better. As you have seen in previous posts and threads, I like having a long string of actual size photos taped together, so basically the painting is just following along from the photos.
[
attachment=20032]
I lightly penciled in the upper treeline (tree - sky junction). I did end up making the treeline lower behind the existing painting building and all the way down the line just because it felt better than my photoshop trees.
[
attachment=20031]
Here are the brushes I use. They are round brushes with flat tips made for stippling. These are from Hobby Lobby. The smallest is about 1/4" around. There is also a "fan" brush that I cut the sides off of, for a different texture of stippling.
[
attachment=20030]
Paints - Awhile back after having decided to paint the backdrops, I mixed up a whole bunch of paint of various shades of green. These are from the big bottles of acrylic craft paint from Hobby Lobby. The colors are limited, so buy green, black, white, tan, antique white, brown, and gray. Buy a bunch of the green. Then mix various shades of green.
Olive greens... very dark to very light... these are what I use the most.
[
attachment=20029]
Greens.... very gray to a yellow green
[
attachment=20028]
For the trees, it is mostly a stippling technique. First, load the brush by dipping straight down into some paint
[
attachment=20027]
Then dab the brush straight down onto a flat surface, to remove excess paint. This can also serve as stippling practice. Don't take off too much paint. You want a very light dab to leave the "leaf-like" texture. If you press too hard, it makes a big glob, if you take off too much paint, you have to mash the brush down too hard, and that leaves a spot rather than leaf texture. This does take some practice to get a feel for it. Once you get the hang, it goes pretty fast. Intuition will have you blotting too hard and too fast and too much before loading the brush again. Really, it should be: load, dab twice on a flat surface, then go to the backdrop, dab 4 to 6 times very lightly, then repeat. If you find yourself dabbing dozens of times without reloading, you will be making a solid color instead of the leaves. Practice practice practice and think about what you are doing.
[
attachment=20026]
Also doesn't hurt to practice on some masonite boards painted blue. Makes it easy to sit at the workbench and practice in comfort, before trying the techniques on the backdrop. I know that practice seems like wasted effort, especially when you make some respectable trees that will just be thrown away, but it is really necessary. Here are some of my practice boards:
[
attachment=20025]
continued....