When you press F4 , “Mode” option will appear in the composition panel. When you click on the mode option, it will come with a list of option like color, multiply, darker, hard light, overlay etc. By using this option you can not only change the appearance of image but also can blend or overlap two images on each other and make it appear as single image.
The file extension for, Adobe After effects project is .aep.
In the composition panel, select rotation option by pressing ‘r’ on your keyboard. Now on the right hand side you will see numbers, which show how much degree you want to rotate the picture. You can rotate the picture by increasing and decreasing those numbers.