Step 6: Darken the arc on the right side of the head to create the poison dart frog's muzzle. Near the bottom of the muzzle, draw a line that angles to the left for the mouth. Extend the line for the mouth to the left so that it's under the eye. Inside the top part of the muzzle, draw a tiny oval-like shape for the nostril.
Step 7: Above the eye, along the edge of the initial circle, draw a curved line for the frog's brow. To the right, draw a smaller curved line for the brow that's on the other side of the head. Below the mouth, draw a couple of curved lines to emphasize the structure of the head.
Step 8: Use the angled line that's inside the body as a guide to draw the frog's first front leg. First lightly sketch the shape of the leg around the guide line. Keep the edges of the leg close to the guide line so that the leg is skinny. Curve the lines to emphasize the muscle structure. At the bottom, draw the toes along the path of the guide. The toes are made up of long, thin shapes with rounded tips. Draw three toes pointing forward and one pointing back.
Step 9: Use the lines on the right side of the body as guides to draw the other front leg the same way. Lightly sketch the shape of the leg around the guide line and only darken the lines when you get the shape right. At the bottom, draw the toes as long, thin shapes.
Step 10: Darken the curved lines on the left side of the body to create the poison dart frog's hind leg. Add a few short, curved lines within the shape to give the leg more structure. At the bottom, draw the long, thin toes along the initial guide.