I used to Pen Tool for each head to create a selection and move the heads to the space background. I then used Free Transform to resize and rotate the heads. I placed the heads in the desired positions. I also increased the brightness of each head to make them more visible against the background. The head to the far right is baby me! :)
Original pics combined into a collage to save space
Butterfly Wonderland - After
For this photo, I first cropped the butterfly pics and moved them to the Butterfly Wonderland background. I then used Free Transform to resize and rotate the pictures. I added a drop shadow to each picture. I then added the text to describe the photo and its location.
I used the Pen tool on the first image to create a selection that just included the children and subtract it from the background. I moved this selection onto the background. I used the Free Transform tool to change the size of the children. I then brightened the background slightly.