I've been working on Diablo Lake Island, North Cascades for several months. Egg tempera paintings are built up layer upon layer and they take time. I bought the panel from True Gesso and love the smooth gesso finish. These panels offer a beautiful painting support. I am so grateful that these quality panels are available ready-made--saving me the hours it would take to prepare them myself.
I'm including a few of the earlier stages of this painting to demonstrate the process.
Step 1. Here I have sponged on several layers of a gray-green mixture. I use Daniel Smith dry ground pigments with egg yolk as the binding agent. I find just about 5 or 6 of the pigments are adequate for most of my painting needs. A jar of dry ground pigments will last a long time, so it isn't especially expensive to get started with egg tempera. But don't buy ready-made egg tempera paints because they won't work at all the same way and you won't achieve the beautiful lustre of home tempered paint.
In step 2 you can see that I have begun to sponge on the shapes of ridges and the island. In addition to the sponge, I used a flat brush lightly charged with paint. Before brushing, I dab the brush on a cloth to release the heaviest load of paint. If you leave blobs of paint on the panel, they often run the risk of being lifted by the next layer, so thin layers are important in egg tempera painting.
In step 3, I adjusted color towards yellow on the trees in the middleground where colors began to be warmer. I also scumbled in some white over the entire panel.
In step 4, I used the flat brush to describe individual trees more specifically.
In step 5, the island trees and rock shapes are finally given more concrete form, plus I began to indicate the reflections in the water.
If you are interested in learning more about egg tempera, I recommend taking a class from the master painter and teacher Koo Schadler. I have had the privilege of studying with her in 3 different classes. Her craftsmanship and knowledge of this beautiful and historic medium are unparalleled.