This first one is what got me started. My girl Khloe @ 5 months old. One reason I picked her is because she is gray and the highlights/shades were obvious. I think it is my "cleanest" looking pic, but that was probably beginners luck. 
origional (sorry scanned pic is blurry): http://i38.photobucket.com/albums/e111/Kahlan_Killian_Khloe/kloe2.jpg
Drawing:
http://i38.photobucket.com/albums/e111/Kahlan_Killian_Khloe/cdb7c1195dae.jpg
This is my second, Cole, a friends dog. I don't have any other pics of this and sent the origional before learning you shouldn't *oops origional: http://i38.photobucket.com/albums/e111/Kahlan_Killian_Khloe/Sleepy_10_3_6_001_sized.jpg
drawing (I changed the front legs/paw a bit) http://i38.photobucket.com/albums/e111/Kahlan_Killian_Khloe/9f6fb804e86e.jpg |