You lighting is almost perfect. Just a small amount of glare on the left side. It could be a secondary lighting issue. The way to tell is to place your hand on that side of the coin. If it blocks the glare and doesn't block your lighting source, then it is a secondary lighting issue. The fix? By placing a strip of paper or something to block the glare, then it will be gone.
Inexpensive fix. Paper and tape. See if this helps? CoopHome
: Unwanted secondary lighting issues. How to fix it?