It does trick you into a B/W photograph with altered contrast and exposure when you see it from zoomed out, but it's amazing how well detailed can something like an eye come out when done only in pencil, while some of us reserve that medium only for our sketches
I love the way you shaded it, it feels so 'free and unpretentious' (if that makes sense xD). The eyelashes are well done too, I just think the left eyelashes on the top could be more messy. I love the bright of the iris, but it could have a gradient with more contrast, more tons of gray and more white in some spots.
You did a great job, it's very pretty and realistic.