I recently got into painting, and well, it's so much different (but, somewhat the same...?) as sketching... Hahahaha!
I find that playing around with the viscosity of the paint is much more complicated (and less cooperative!) than pencil. I often find my 280 gsm-thick paper scrunched up and soggy with all the water and rubbing I'm doing! It's SO much difficult to control!! Hahahahaha! :D
But, I find it SO much fun and brighter to do painting than pencil sketch :)
Maybe it's the touch of colors...? ;)