Hi, I would say no problem at all having more than one model. A number of shops do. Also, read in a thread recently that the order of the words in your title and your tags should be the same. Don't know if that is correct, but I noticed that yours are not. For example, If your title is pink chunky cowl, one of your tags should be pink chunky cowl.
When you make a new listing, at the top you fill in the categories, etc. I think that is probably what you are seeing with the extra tags. All of my items have the tags 'jewelry' and 'necklace' because of that.
Good job!
Lanny