In case anyone is curious, I use a combination of original models and premade assets. Obviously you can't get anything done in 3d if you make very doorknob and leaf yourself, but what is front and center is always my own work.
For example, my anthro character models are put together by me, but I do use geometry from some Daz figures, a retpo of the the Discopears pony head, as well as elements from scratch, that I incorperate into a single model and custom rig. So a lot of what you see is original, a lot is pains-takingly kitbashed, and other elements are assets whose licenses permit reuse.
I make a point of citing any appropriate CC attributions, but the tumblrpocalypse ate a lot of the notes that I put up with image posts, and that information wasn't always mirrored on the derpibooru posts.
So I'll do my best to make sure everything is squared away in terms of attribution, but I can't promise nothing will slip through the cracks. Sorry about that.
Also: I'm happy to share any assets I have made if asked, though I haven't gotten around to getting my character rigs into any sort of shape that would be usable to someone who doesn't already know how they work, because that will be a big project.