I got inspired by an eye, it´s something simple but, I wanted to practice with some new tools. (The brush and the pencil) two basic tools that came by default in the software Photoshop.
I started the drawing with the shape of a lemmon for the eye and to the background a skin color. I added some flat shadows and then I did the little veins of the eye with the tool "pencil" and added some depth shadows with the tool "brush" in a low opaccity.