Artangel: Mixed media crumpled tissue technique - tutorial - basically, glue tissue paper over a canvas, let dry. Paint, let dry, then rub oil pastel or crayon over the surface to highlight the texture.
Want to learn how to paint trees? This very detailed step-by-step tutorial will show you how to paint 5 different trees. You will amaze yourself and enjoy these techniques every time you use them. (Diy Step How To Paint)