I signed up for a free, online course through edX: Natural History Illustration. I must have thought I had some free time. I don’t, but I signed up anyway. Here is my object drawing for the first assignment: cattail, gourd, petrified wood (just in case you can’t tell). I’m not sure what the reference notes are supposed to include for a natural history illustration. Thank goodness for Wikipedia, is all I can say.
It's a long story ... 
Excellent! I’d love to join up for a drawing course, but don’t think I’ve got the time…..
Find a self-paced course and work it in when you can.
These are beautiful! You continue to amaze us with how much you do!
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Loved your drawings ♥ keep going and sharing!