How to determine the size of the neck? How to find out RA

He worked in a jewelry company. My main task was call center and increase sales. But, as usual, in addition to my direct duties, I had an additional job. He created advertising banners, worked with a photoshop, wrote reviews and description of the product, engaged in promotion in social networks, etc. I was thrown to help the employees who wrote SEO texts (with keys). This is one of my creations. The work is very unique.