Shape before texture
|Blue Wall, Methow Valley
Get outside, if you can, and find a scene that can be understood in terms of three or four layers (light, middle, dark, super dark). Working from a photo is fine, too.
Identify the major shapes. These are the ones that need to appear separated in space to promote the illusion of depth.
Paying close attention to relative value, block in the shapes, layer by layer, keeping texture to a minimum.
When the darks have been applied, decide where you want more specific information, and put in texture a little at a time.
Stop before you think you’ve got enough, and go for a walk.