These are two images I created to look like reflections. I duplicated the turtle in the first image, then dragged the two turtles together. In the second image I used layer mask and then changed the opacity of an image to look like a reflection in someone's sunglasses.
This is a collage of many images that I created to be a greeting card. I added layer masks and hue and saturation adjustment layers to some of the individual pictures.
This is an image that I added edits to, such as a black and white filter, to make it appear old. I the changed the gradient and added coffee stain brushes.
This is an image I created to mimic the work of David Hockney. I selected small portions of one image, then added a border to these portions to make it look like my image was made of many individual pictures.
The top image is a collage by the photographer/artist Barry Kite, and the bottom one is a replication I made of his collage by selecting and layer masking images I downloaded from the internet.