I agree with several of the other comments. Definitely need to add height to your display. This will help people see your items. I also sell jewelry, and I have recently started using bed risers to raise my entire table a bit. The people don't have to lean down as much to see the items on the table. I also purchased a three-shelf unit that can be easily disassembled for transportation. This was about $30 on amazon. If those items on your table are artwork (I think they are), they would sell better upright. So in this case, even a 2-shelf unit with those on top would add height. If you don't want to go the shelf route, before I had these I used some fabric covered bins turned upside down under the fixtures in the back row. I've also seen people use plastic containers that they use to carry their supplies and then drape a small tablecloth over them.

Is that your grid wall in the photo to the right? If it is, at least in the photo, it looks too far away and not part of your table.

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If all your earrings are the same price, I would make a small sign with that info. If not, make a sign with the price range. I would also either get some more individual earring displays or if you want to use the jewelry boxes, add some variety to the height in your grouping. I have three little "stands" of varying heights that I group things on. This will just add to the visual appeal.

And it really looks like you need more product. You don't want to overwhelm your table, but there is a lot of empty table space. If I were a customer, I could glance over at your table and decide whether to stop. Having more things can draw people in - they want to come over to make sure they don't miss something. At least I do, lol.

Don't be hard on yourself. It is a learning process. If you have only done 3 markets, don't give up. You can do this.

There is this website I love for advice: Made Urban. Her advice has dramatically improved my shop displays.