A bitmap fill can be applied by selecting the fill tool, selecting the shape and then selecting 'Bitmap' fill from the top toolbar. From there you can drag and drop your own photo onto of the fill to replace it.
The Photo is sized to just fill the visible shape. You can resize and rotate the image by dragging the ends of the fill arrow (the correct aspect-ratio now remains locked when you do this). You can push the picture around inside the shape by dragging on the center fill handle, anywhere on a fill arrow or by holding Shift and dragging anywhere on the photo.
If you hold Shift while dragging the ends of the fill arrow it will stretch / skew the bitmap. Holding Ctrl will constrain the angles.