Question about how we can better selling?

Pretty strange name you chose. And only one render on each model.

Nice work!

Low prices can scare away buyers, they will think that the models are stolen. Also, at such prices you will not earn anything, sales are quite rare, so it makes sense to put the price much higher.

That looks an awful lot of work for $15 mate. Are you sure you didn't "borrow" this model from elsewhere? :D