i was interested when trippy posted one photo with people i knew from chat and i was curious, in order to draw and put him or her into one does one need to give them a picture of what they look like irl? : 3

No not really :P

I made my OC just by making a text only description

Most artists tend to shy from text descriptions for characters, but thats mostly the avoid people who write huge paragraphs of high specific details that end up harder to draw than helpful. But hey its doable without a picture, but any reference material also helps, depends on the artist.

Well first of all welcome to the community ^^
I hope you will enjoy your stay here, that you'll get the chance to discover how awesome hypnosis can be (both erotically and non erotically speaking)
For commissions, you would need first to ask an artist that would work for you, asking for their prices and such and make sure they are ok drawing what you ask for.

Then I can just help you with this link that contains the do or don't of the commission process.

amaipetisu.com/post/96089764657

Here it is.

Look up hentaifoundry for artists or send DM to artist through the hub to check who you would like to commission.