The block is on a free pattern site so hope I am not stepping on anyone's toes:
Make a 12.5" sq on paper. Mark off 1/4" on all edges. Divide inside sq into grid 5 x 5 sqs so that there are 25 sq's in the 12" sq. Going by design (except for right top corner, there are hst's on the points) draw angles. The right top "block" will have a longer top line and shorter bottom line. Then color or scribble the dark parts and you will have your pattern. Measure each section for size of each piece. Just remember to add seam allowances.