Declaring sold artwork?

I’ve just taken part in an art exhibition and have sold 6 paintings. I would like to be registered as a professional artist however can anyone tell me what is involved? What benefits are there to be registered?
I presume that the 6 paintings I’ve sold will be my total of art sales for this year so is it really worth it to register until I can become more active?
Also, do I declare the 6 art sales to urssaf? I’m registered with urssaf as a profession liberale (I give art lessons and english lessons) but I guess I could declare the sales when I declare my income with them every month.
Any advice most welcome!

How about talking to…