It looks amazing!

The blink rate and approximate intervals seem pretty decent to me. I think you have a nice balance between blinking too much to be subtle and not blinking enough to get attentions. Once attention is gotten with the blinks, I think you need to catch people with a colour change then right about when they are getting used to the blink, to further rell them in. So maybe a colour change cycle that is shorter or on demand if that is possible.