Shadow,
Sorry if I came off as critical (I was posting from my phone so I didn't elaborate). I think there can be a blue tint/hue but it has a lot to due with the lighting (any visible color anywhere has something to do with the lighting) I have seen some people/vendors (monsterrays inc.) photoshop solid blue eyes on BD's...this is total BS. The best BD's in world have brown/white/drk brown modeling of the eyes as it looks like your's does, but the hint/tint/hue of blue is not a determining characteristic to me or breeders that I have talked with. It is nice to have it and you have a stunner, but I don't think it determines BD/not BD.
Overall, I think there is a lot of variability in the quality of BD's - that may be where some of the gray area comes in. From straight classic Leo to AAA++++ BD is just a spectrum of quality and the arguments will continue, but fortunately each ray is different and it leaves it up to personal preference.