Better than upgrade the coin, maybe should you upgrade the photographer.... Well, sorry, I couldn't resist Your coin is great Steve, but the pic is so-so Q
For the record, my coin photos are taken with an older model Can(n)on. I'm sure Nikons would do just as well but I have had the old thing for years and rarely use one of my more recent models (also both Canons).
Not too ornate if you are the enemy of the Tsar at whose city it was being aimed. It was fired but it was never used in war. I believe it was the largest cannon of its type brought to you by the same people who gave us the worlds largest bell. They liked to cast bronze.