Here's the back of the block. Notice the tiny "4-patch" formed by the way I pressed the four square unit. I pressed the block so the seams are pressed away from the half-square triangle units. This will allow easier joining, and less points cut off when putting the quilt blocks together. Where the rows are joined together, the seams are pressed in opposite directions to help the seams "nestle" together and line up accurately.
Click here to see the front of the block.