I've spent many enjoyable days in St Augstine, with its seemgly unending supply of photo opportunities.This one unfortunately may be as the above post said, one of those "cool pic to record a memory. I don't find the woodwork objectionable as it's as much a part of the beauty of the window as the glass, but the glass lacks the brilliance and color one would expect, allowing the woodwork to overpower the scene, plus the tint of the middle pane is different then the ones on the outside. Having the stairs in the pic is a definite turnoff, I've been to Flagler, but I can't remember the window, so I don't know if there was another angle that would have highlighted the window better. Finally learning the elements of the exposure triangle and how they interact so you can make and informed decision on exposure. Knowing how your camera handles higher ISOs and how to correct in post also helps Letting the camera choose on auto exposure isn't always the best solution. F/2.2 is a little wide if you expect to get a good DOF on the window, 1/320 is okay outside, but inside it forced your ISO up to 1600. Using a tripod/monopod and dropping your shutter to 1/30 would have gained you 3 1/3 stops, to split between dropping your ISO (helping with noise) and raising your aperture (helping with DOF and sharpness).
For stained glass, and good unobstructed shooting Cathedral Basilica of St. Augustine is hard to beat.