Your models look good. I don't see a problem offhand. You only just uploaded most of these in January of this year, so that's only like 2 months ago. You need to give it time and you need to establish yourself before you can expect to make many sales. The truth is, marketplaces like this one are really huge, and unless you are a very well established artist with a large portfolio of quality models, you aren't going to see sales happen as often as you might hope. You only have 13 models currently in your store. While the models are very good, you're going to need more than double that amount before you can expect regular sales, and even then you will need to keep adding new models often to keep the momentum going so to speak. You should choose a niche where you feel comfortable and model mostly for that genre, building your portfolio. I would recommend avoiding oversaturated categories and try to find something unique and interesting, but also something you think might be popular.
Realistically speaking, don't expect immediate results. A product you upload today may not begin to generate sales for you until months later. Maybe not even until next year! It really all depends on how much in demand that type of product is. As a new creator, you should focus your efforts on making new products as often as you can and uploading at least once a week but don't expect anything to sell immediately.
Pricing is all up to you, but one of the biggest mistakes anyone can make is underpricing their work with the expectation of selling more in volume. That's not quite how things work here. Maybe that would work in other amateur or hobbyist markets, but most people who purchase here are working for studios or on their own projects with deadlines and they will pay for what they need when they need it. Yes, overpriced items can cause you to lose a sale, but underpricing will almost certainly lose you money as well.
