If you're using dark colored rocks, paint your selected rocks in 3-4 coats of white acrylic paint. We use a matte finished paint for the ones pictured here. We also paint both sides of the rock, but it's really up to you and whether you care if the entire rock is the same color. Let the rocks dry completely before moving on. 

Sketch out the alien drawing with a pencil before you use the paint pens. 

To draw the alien's head, begin by making a large shape similar to a football. Use the light green paint pen to outline and fill in the head. 

Sketch on the ears, by drawing a straight line up and out from the side of the head. Draw a triangle shape on the opposite side and slowly smooth out the shape and loop around to create an ear lobe. Use the light green paint pen to fill in the ears. 

Draw the alien's antenna by making a skinny, tall triangle in the middle of his head. Top it off with a small circle on top. Use the light green paint pen to fill in the antenna. 

Make the alien's eyes by make one large, circular eye in the middle of the head, just below the antenna. Next draw eyeballs on each side of the center eye. Make these 2 eyeballs slightly lower than the central eye. Use the black paint pen to draw in the inner eye. 

Draw a smile on your alien. If you want to keep it super simple, make a straight smile. If you want to make it more iconic looking, draw the original smile than draw a flattened oval shape in the middle of the mouth to give it the "oooooooo" look. Use the black pen to draw in the smile. 

If you want to preserve these rocks for a very long time, use a couple of light coats of sealant spray to finish them off.

Repeat on as many rocks as you'd like!