What works for sport should work for most endeavours; notice that most of those are obvious and explained below only because I suffer from 4chan autism:
Eat a Healthy Diet: Fruits, vegetables, whole grains, and fatty fish.
Sleep 7-8 hours of uninterrupted sleep per night.
Exercise Regularly. Even a single session per week can relieve stress and improve mood.
Express Yourself: this one is easy if you're drawing often.
Reframe: attend to the ways in which you think about and interpret stressful situations and look for opportunities to reframe the situation in a more rational or positive manner. Reframing is not "just be positive bro" and more about being grounded.
Engage in relaxation exercises on a regular basis and during periods of moderate to high stress. Progressive muscle relaxation (PMR), guided imagery, and meditation are great ways to reduce your overall level of arousal.