Step 1: Begin with the head shape. If you have trouble, this looks like an open arrowhead, with a zg-zag line at the back end.
Step 2: At the top end, draw a triangle with a line through the middle for the right ear. The left ear sits just above the zig-zag line, and is drawn as a semi-circle.
Step 3: Draw one large shaded circle for the left eye, and a smaller shaded semi-circle for the right eye.
Step 4: Draw a circle at the front of the head for the nose, and several long curved lines on either side of the face for whiskers.
Step 5: From behind the right ear, draw a curved line going back to the left for detail.
Step 6: Your mouse is now complete!
How to Draw a Mouse Head – Step-by-Step Tutorial