I am pleased to see that you have drawn all the details extremely well, and you didn't even forget about the eyelashes being reflected in the eye itself!
The shading is magnificent and the iris is done in a very realistic way. There is no doubt you have skill. As you stated you just drew the eye of your husband, probably for the purpose of a study or practice, so there's not much originality in it, I'm afraid. Still, the technique more than makes up for that.
However, I have one small problem: While the eye and the eyebrow are super realistic, it feels like the surrounding skin, especially the nose and right under the eyebrow, is a bit flat. Now, don't get me wrong, the shading is fantastic, it's just, if you can see all the tiny wrinkles under his eye, I believe you also should be able to see pores, imperfection and all that stuff that creates the texture of the skin. I think, your picture lacks that in the darkest areas and also in that light spot right under the eyebrow. Maybe it's becaus it is a close-up of a tiny part of the face, but having that many wrinkles under the eye and almost no imperfections on the skin surrounding it, creates kind of a contrast, like if he had the eye of an old man and the skin of a woman... I hope you understood, what I meant