I hope it’s okay if a lurker pops in...someone else mentioned Gretchen Halpert’s Scientific Illustration Distance Program, and I wanted to chime in about that. I have completed sessions I and II, and plan to take session III this fall. I am learning a great deal in this program, and I would absolutely recommend it if that can be an option for you. The instructor and class critiques of assignments are particularly invaluable. I’m hoping to join this field as well, so I have been paying particular attention to your query and am really glad you are asking about these things - it’s such helpful information!
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