It's amazing to see how simplistic the sketch is for some these when you see the detailed end product!
When it comes to coloring full illustrations for me, I tend to get rather impatient in the initial stages like sketching or base color. I really love the painting process and sometimes the initial steps feel like a chore so I just stop when I really just want to start full on coloring. "Hurry up and let me paint..!" That's what it feels like sometimes haha 
So sometimes it looks super different from what I drew out lol.
Here's one I did for a zine I just received: