Favorite part of the art creation process? I'll list a few items to give ya an idea of what I mean:

Do you like to conceptualize? Day dream about how the image will turn out?
Do you like to sketch? Hammer out how it's supposed to look?
Do you like Lining? Making all those smooth lines, perfecting the sketch?
Do you like coloring? Bringing the piece home?
Do you like slappin' filters on the piece? Watching it change moods and feels with the clicks of a button, the tweaks of numbers or angles of mouse clicks... and many other methods of applying a filter?
Something else because my mind is limited?

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My favorite is coloring. I'm -ok- doing lines, but coloring is just so goddamn fun. I love smearing the colors across the screen and rubbing the smoky, fuzzy dark or light colors around for depth. Doing it just so. I'm not saying I'm the best, it's just oodles of fun.