My advice would be - if you are going to revise a model do it on one that already sells well (if it needs revising). Imagine going to bakery and no one likes the taste of their celery muffin, so instead of trying a new flavor they invest their time inventing a super celery muffin with celery sauce, doesn't really make much sense right?
Just keep making new products until you find your niche then double down on that. Also 3D artists are the main people making purchases, so make something that saves them time so they should be well detailed and in demand.
Also work on your descriptions, this doesn't invoke much confidence from the buyers point of view, being honest and not trying to be harsh but we are here as professional merchants, not a charity:
"They are designed to be used in the background as they will not hold up if they are the center of attention." - so this tells me the quality isn't good by your own standard?
"This collection is just to support me if you like my work." - support you why? we also have bills to pay, if your product is good then support goes both ways.
