Picturing Winter, a Solstice Celebration
So many of my favorites! And so many wonderful things I'd never seen before!
How to Make Astronomical Illustrations
Aladdin_Sane: Sprucing up your drawing skills is a great idea! My suggestion would be to find a course in drawing (figure or life drawing preferably) at a local college or university. Most of these offer evening or weekend extension classes. This would be much better than anything you might find online.

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