You can use the Picture Size and Exposure groups of the Picture tab to format an image you insert.

You can Pan & Zoom the picture once you've added it to a shape so the subject of the image (e.g., a face) is shown.
Click the Crop button to crop and resize the image to various standard cuts such, as 4x6.
If you insert the image into a shape other than a rectangle, you can Trim the image to match the shape.

You can also adjust the Brightness and Contrast of the image using the controls in the Exposure group of the Picture tab.