If you want to use it as a part (let's say background) of a different picture, then NO, If you want to use it for commercial purposes, then NO again, but If you want to just use this picture as some card for your own non-commercial purpose, then it's ok - although - this is the biggest resolution available.
You always amaze me with your work no matter who long/short it took for you to do it. This piece shows a lot of detail and focus on the lighting as you've mentioned and I feel that you've successfully portrayed the lighting without a problem. Good work! :3