I made this using a watercolor pad, watercolor pencils (Colors: Bubble blue, Deep blue, Marine blue, Blue lagoon, lovely pink, Gaïa, Aubergine, and Ultra violet), a normal mechanical lead pencil, a ruler, and a small brush. Sorry about the bad lighting :( I was at my cousin's house and I made it for her. The watercolor pencil brand is AQUA color'peps by Maped. Really good brand. I sketched the colored in recklessly. Used a brush to apply the water and blend the colors. If it didn't turned out how I liked, I added another color and BAM! All done!
DontTestMySanity
I based this off of the image below.

Of course it's not the same, nor is it close, but this is my inspiration.