That's right Razi.
This one is a lot of different things. First the paper, it's fairly important believe it or not. I used watercolor paper (but I dont think I will next time not sure yet). First I did a watercolor style with my Acrylic artist's ink. They can act sort of like watercolors but they have a few different characterists and don't do the same things watercolors can. similar but different!
Then I used both watercolor pencils and normal prisma colored pencils. Primsa colors are pretty good, but they can be a bit pricier . Generally you can get them for about a dollar each, or a decent set for around 10 to 20.
dickblick.com , rexart.com , cheapjoes.com are all decent places to get supplies from.