STEP 4. Mark monkey’s muzzle middle line. Place ears, eyes, brow, nose and mouth position with straight lines. No details, only proportions.
Place monkey’s palms and foots.
The rounds are joints, the lines are bones. Do not be lazy to look up for information on the structure of the object that you are trying to draw. Especially when your goal is for most realistic picture.
STEP 5. Now it’s time to work on "muscles" layer. Draw with smooth, curve lines the body outlines. Do not forget about chimpanzee’s face. Place the ears, eyes, nose and a mouth.