I chose this piece of work to use as an example to explain methods that i have used in my own work but also as this person has used in their own work. On phtotoshop the white pictures in  the background have had the tones and exposure changed to give this effect, the yellow flower has been layered on the top and changed the opacity to make it stand out and the butterfly has been made black by using threshold.
This links to my work has i have changed exposure and colour in my photo's then layered them n top of each other to create a more detailed look.