I merely copied the practice from one of the other SVG pages (the main Alfaerie one, I think).
I have now looked at that page. It didn't have the mistakes in HTML I noticed on this page. Although you copied the inner part of the table, you didn't copy the <table> tags. Additionally, the Alfaerie SVG page didn't use <figure> tags at all. Your page is better for using them, because they let you place the name of each piece underneath its image. But you also used <figure> as a container for other <figure> tags, and that wasn't a correct use of this tag.
I have now looked at that page. It didn't have the mistakes in HTML I noticed on this page. Although you copied the inner part of the table, you didn't copy the
<table>tags. Additionally, the Alfaerie SVG page didn't use<figure>tags at all. Your page is better for using them, because they let you place the name of each piece underneath its image. But you also used<figure>as a container for other<figure>tags, and that wasn't a correct use of this tag.