Step 1: Draw the head first. It reminds you of a turtle head doesn't it?
Step 2: Next we add the mouth. Just another line, connected to the head.
Step 3: Now the eyes. Big and round. Fill them in with color.
Step 4: Add 4 eyes below the two big ones. Fill them in with color too.
Step 5: Next draw the pedipalp, or it's feelers. Make it round, rather than sharp.
Step 6: Add the other fang.
Step 7: Last, add some hair to the top of the head.
How to Draw a Spider Head – Step-by-Step Tutorial