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How to send an art portfolio by email
Research galleries in the area where you want to sell your work.
If possible send a personal note or a postcard with images to introduce yourself. Let them know you are interested in submitting your art for consideration and you want to do so properly.
You can check in art listings on-line or local guides to determine what type of art they specialize in. Can you see your work fitting in with the style of their gallery? Read what their policies are on submissions, contracts, fees, publicity, art openings/closing receptions, insurance and collecting taxes.