How To Draw Anything: For Beginners - The Complete Guide To Drawing Portraits, People, Faces And Landscapes In No Time! (Drawing Books, Drawing Techniques, Pencil Drawing) by Charles Johnson http://www.amazon.com/dp/B010FZF7YS/ref=cm_sw_r_pi_dp_hZDRvb1SPMMJJ
Andrew Hem, South America, 2010. Gouache.Different drawing techniques enable various approaches to building up a drawing. Gouache paints enable adding of color in in thick layers which results in a abstract depth in the image and the 3d feeling forms such as rock massifs in the painting.