Hey there! :)
I'm one of the moderators of Art & Design and I just want to let you know that you are allowed to post any artistic medium (digital, traditional, pixel, 3D art, animation, photography, you name it!) that you want in A&D. We have many traditional artists who post galleries, myself included, and I assure you your work will be a welcomed addition.
If there's anything I can do to help you out on the forums, please let me know! Otherwise welcome to PC and happy posting!