Independent artist in Constantine

Heyy I have a friend that she's good in painting and she trying to sell her painting's but the problem is we don't know exactly how besides the internet like posting on Instagram and waiting we want to know if there are any group's or communities on Facebook or smth and also she wanna target some art galleries like Saleh bay here in Constantine but we don't know how we reach them Soo if anyone have any information that can help tell me? And thank uu