05-07-2014, 06:52 AM
Try not to use scribble lines on rock or hard soil surfaces. Their faces can be better defined with lines that follow their forms. Check out these images:
http://www.wikipaintings.org/ru/albrecht...kers#close
http://4.bp.blogspot.com/_AkCA-z5Sbis/TO...+Rocks.bmp
http://brentoncottman.com/2006_10_01_bre...chive.html
http://www.wikipaintings.org/ru/albrecht...kers#close
http://4.bp.blogspot.com/_AkCA-z5Sbis/TO...+Rocks.bmp
http://brentoncottman.com/2006_10_01_bre...chive.html