Photo Fuse
Use Photo Fuse in Photo Gallery to combine the best parts of two or more photos into one. This feature is useful in improving photos, like group portraits, where a person might look better in one photo than in another.
Watch this video to learn how to rescue a photo by merging the best parts of similar shots using Photo Fuse in Photo Gallery. (0:42)
Select the photos you want to fuse. On the Create tab, in the Tools group, click Photo Fuse.
Click the area of the photo you want to replace. Drag one of the points to adjust the size of this area. Click the replacement photo that you like best, and then click Save.
On the left is a group photo and on the right is a Photo Fuse composite of that photo and several others.