For the Montage Assignment, my instructor showed us how to use a mask to select objects. We were to take a landscape picture and add other pictures to it, trying to make it look like those pictures were part of the original. We needed to use at least 3 other pictures. Here is the original picture I chose as my 'background'.
I then chose the following pictures to add into this background. The tip our instructor gave was to choose pictures that have the same or very similar lighting.
Here is my finished Montage: