Watercolor and Words, asked if I was going to do the "Spirit of the Gulf Challenge" hosted by Suzanne McDermott. I hope you visit Suzanne's blog to learn more about this Challenge and go to Facebook to see some of the artwork already posted.
Last night, I went to Wikipedia for more information on the Kemps Ridley Sea Turtle which is an endangered species that lives in the Gulf. Then I had to find a reference photo for this drawing since I haven't visited the Gulf in years and years so I visited Gimp, which has public domain photos from the Department of Fish & Wildlife and NOAA, that are free for use.
Using a photo from the Department of Fish & Game, I did the quick sketch this morning, using an H pencil, and had to up the contrast because it was so light in value. The sketch, as mentioned before, helps me to look at the turtle, notice it textures, shapes and its surrounding area - how the texture of the shell played against areas of smoothness on the Gulf floor then goes into more texture in the rocks.