Was there more beni to begin with? It looks like it has beni that has faded over various parts of the body. I think there is a good chance that the beni on the head will fade
As to whether this is sanke or showa, remember that when hobbyists are considering that question, they are considering what it looks like at the moment, not it's genotype or what it might become. Koi have been known to mature from one type into another. At this time, a small black mark under the eye would not change the classification. However, further changes might, such as extensive sumi through the face, more sumi under the lateral, and a retraction of the sumi in the pecs.
Hopefully, those with more experience than I will comment.