Hi Bob--take the object you are drawing that is to clip the porch photo. Send that outline object to the back and it will still be selected. While it is still selected, hold the shift key down and click on the photo. Now tap the Q key. Make sure to make multiple copies of the photo to clip the other parts as well.

Alternatively, you can have the drawn shape on top of the photo and press CTRL + 3 and the remainder of the photo will be cut away.

Take care, Mike