I'm really drawn to exaggerated commercial style images, whether that be exaggerated light, colors, forms or all of the above. One effect that I use pretty often is creating super sized eyes. It's a fun way to bring in the viewer and create a palpable character or emotion.
The main method I use is as simple as taking my photo, then zooming in for a close up shot of the eye. Blend those two images together using the liquify tool pallet and... badda bing badda boom! You've got a super sized eyeball. Nudging and bulging is a super simple way to shape the eyeball and eye socket. Burning and Dodging is a great way to finish it off by exaggerating the forms of the eyes and making them sink into the face.
Don't forget to line up your super sized eyeball to fall on the correct anatomical line. Also reshaping the brow line to make a properly sized eye socket might be needed depending on how large you want to go. Check below to see a step by step tutorial! :)