I signed up for an 8 week zoom class given by Char at @blueshineart. (Check out work, and her students' on Instragram.)
She takes a mixed media approach, which is a challenge for me, but a good one.
These exercises are, I think, from week 3. Which puts me about 5 weeks behind!
Often times her reference photos look so difficult and/or complicated to me, but she gets you to jump right in with 30 second to 5 or 10 minute sketches, using all kinds of markers, crayons, paints--whatever you have.
I think it's a great approach--no time to angst over what you're doing or to get too invested in any one sketch. You stop thinking about the "difficulty" ... and the results can be surprisingly pleasing!