Xuv the main difference is that most of my paintings are HUGE! My watercolors are all about 2feet by 1.5feet I'm not used to small canvases. Unless I'm working in ink. So bringing my techniques into pixel art has been a challenge because I'm used to getting so much more into my pieces. Did you see the tadpole I pixeled? I took a much more painterly approach to that one.
Eventually I will figure out what I'm doing and (hopefully) my pixels will get more refined as I go. I'm still learning and there's so much to learn!