some restaurant owner held a reception for me and other students because our artworks are displayed in her restaurant.

she is offering $400 for my painting. some other people wanted it too, according to my art teacher.

i don't know if i should sell it at this price. i mean, i know it's a great offer...

but i don't produce quality artworks all the time. i am not a prolific artist. i barely have anything in my portfolio. i am not going to be an artist. and i really like my painting. i want to sell it and i don't.

should i sell it?????

and if i do, should i ask for more (i want $500). it is right for a student to bargain when someone has already offered a price that everyone else is pretty much begging me to sell? i'm not being arrogant; i just want to know. i've never sold any paintings and i'm totally new to this.
please help me!