Recommendations for a 2.5D Art program

Hi, I’ve been using GDevelop for about a year and a half now, and I’m really interested in making 2.5D Games similar to the Original Five Nights at Freddy’s. My problem isn’t actually a problem on GDevelop, I’m just reaching out to the community if maybe anybody has any suggestions for Art programs that are simple to use that I can make 2.5D art with ( Specifically the rooms, the Animatronics I will figure out )