Gentlemen, I am now looking for artists for 3D rendering of interior for a medical clinic.

Here it is better not to look for some freelancers, but contact a company that only does this. Then you can count on a result that you won't be ashamed of. Go here https://renderzen.com/interior-3d-renderings/, and here you will find performers who will do everything within the specified time frame without mistakes. Everyone will be satisfied.