I just recently started trying to sell some online. I have been making cards by pasting my old watercolors onto blank cards with envelops. I am posting them on Facebook only right now (as posts, not as items to buy through FB itself because: fees), so my audience is only friends and family so far. I am a beginner artist so I am only charging $4-6 per card.
I have had one person request a set so far, so your mileage may vary with this approach, but for me it made sense as a free way to test the waters for now.
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