For what it's worth - I've looked through your images port, and majority of it is repetitions of same subjects; you probably have about 15-25 unique subjects (unique to your portfolio) from 455 photos right now. Most of subjects are very common (beads, cacti, plants in pots), there are thousands of those in the database already. It will be very hard for you to compete with such images.
On average, people here tend to sell about 4% of their port per month (some much more, some much less). With 25 unique subjects that's about 1 per month for you.
Composition on many shots is not that great. You do have some nice shots, i like this one: https://www.shutterstock.com/image-photo/stone-jewellery-lots-different-stones-colorful-1344537014?src=pYeCMJhDrX9KM_Buug7-0w-1-12
But having said that, this image (along with others) is lacking keywords and description. If buyers cannot find your photo, they wont be able to buy it.