Note that water hasn't been applied to this sketch... yet... The coloration will change when I do that. I need to research how to produce a sandy-looking texture for my background before I add some water to change the colors of this drawing. As with my turtle, I used water-soluable colored pencils, but intending this one to only be a practice exercise, I didn't transfer it to watercolor paper.
Also worth mentioning: The colored pencils I use don't erase well, so correcting the error at this stage isn't possible. If I had spotted it before I added the color, yes, I could have made the correction... which I should also note is a good reason to delay a bit before adding color and after I THINK the initial graphite sketch is correct.
Starr Fish - A Drawspace Lesson