Here is a small demonstration of how i first used Photoshop and edited one of my own photos.

With this picture i was really trying to over exaggerate the effect of the light block, therefore i cropped the image to make the block more central and in the focus of the image.

I also increased the brightness of the block and the contrast against the background to give the image a greater depth and again to highlight the block.

I then turned the pink/purple hue up to change the color of the grass giving it the luminous effect it has now. This increases the contrast between the colour of the grass and the cube which makes the image more powerful.