I still struggle with shading and half the time I dont know what the heck I'm doing! A word of caution: do not use a heatgun or a hairdryer on top of oil pastels because they will melt! Even though I know this, I keep doing it myself, duh!
Here's my happy little picture, Tam style. I'll link in her video at the end of this post, in case anyone feels inspired to try this too.
Here's a link to Tam's video on YT: