Step #1
Draw a rectangle & a line for the handle.
Step #2
Draw shape as shown.
Step #3
Draw this shape.
Step #4
Draw handle.
Step #5
Enhance the head of the hammer.
Step #6
Make lining over the head.
Step #7
Draw several lines over the handle.
Step #8
Draw several square shapes.
Step #9
Enhance drawing as shown.
Step #10
Make necessary improvements to finish the drawing.