Scale and Proportion - Photoshop Collage

This collage consists of six separate photos, all taken by myself. Layer one is the sky, on which I made a few hue adjustments. Layer two is the off-perspective building, with some hue and saturation adjustments and an inner shadow. Next was the main background image, which I left pretty much the same, doing a few hue adjustments. Then, I used the magnetic lasso tool to select my boyfriend out of a photo and add him into the image, super-sized. I then used the same tool to select an elephant out of another photo I had taken, and used it to create a parade of elephants around my boyfriend. Lastly, I added a photo of myself as one of the billboards in the background.