Curious about those who have gotten to nimitta through using the breath in the nostrils as an object.
Do you find it easier to concentrate on the whole area of the nostrils, or just one small bit?

I was first struck with engaging visuals while doing my first Goenka retreat, which means I was slowly scanning my attention, small patch by patch, along the skin of my body, all nowhere anywhere near the nose.

Now I also get it when directing attention to breath sensations around the nose, anywhere at all, the important part being to actually be engaged with actual sensations as opposed to thoughts about the situation.