The following is an after thought from posting on another thread
After painting my basic plaster mountain with a single color, it looked beter, but kind of blaa as the world was only one color. I will add more brush and trees later and of course detail the track.
After painting my plaster mountain with a earth tone latex, I used very thin washes of yellow oxide, burnt umber, Paynes grey, burnt umber, raw sienna, and hooker green and all most overlaped them, on the second and third coats of this thin wash I overlaped them giving the payns grey for shodows and the hooker tint in grassy areas.
This canyon is painted different as it is Bragdons Geodesic Scenery. First its painted with Gesso (same white paint as to cover an artist canvas) . After the Gesso drys, black tempra powder is brushed on then wiped off with a soft sponge, leaving the black in the crevices, leaving a dull grayish tint on the rest.
Then with the above colors one at a time, using a very wet one inch brush, a minute ( A tiny bit of paint) amount is brushed on the rock surface in spots, so that when all the colors are used it will compleatly cover the area, while using a soft towel to catch drips or runs, blotting them off.
Using a thin wash will let the gesso bring out some great color and it will really pop out. Every visitor trys to touch my canyon’s cliff, then ask if it is really rocks,
Then several more coats of these very thin washes overlaping untill you get the effect you want, sand tones for desert and the greys and greens for granit. If one paint to much color, just Gessor over and do it again.
Just my two cents…John