Step 1: Draw with rounded lines to create the outline of the face and the two lines inside the head. Then, use tiny "V"s to add texture to the head.
Step 2: Use curved lines to create the eyes.
Step 3: Draw mostly straight and jagged lines to make the antennae.
Step 4: Use squarish shapes to draw the antennule.
How to Draw a Lobster Face – Step-by-Step Tutorial