Tree Stump

These days, I’m a lot into the video game Ori 2 and the art inspire me a lot.
So, today I began this drawing of a tree stump, trying to aim for the same colorful and stylized vibe.
However, I feel like I waste a lot of time in the process so far; do you have any tips to paint faster ?
I try to slowly push my art into a more realistic and detailled way, but I often lack of patience near the end. So if you have any recommandations it’s very welcome !