Photography Cards

Hello! Well, I'm really into photography and I start tto sell some prints mounted for 1.50 to my friends and hopefully my mom says I should do a little more eager to make greeting cards! I thought it was really cool and I sell it as 3.50

Is this a good idea?

This is an excellent idea because you have an established clientele. Everyone needs maps, and they can just get all their cards in your hand.
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Yes
If you like the idea, you should definitely go!
Good luck!