No, lower and about 1" lower than you would button a single breasted jacket. This is a generalization, would be more specific to the individual
need some advice on the shape of the peak lapel too. I can't make up my mind on how much should the point be pointing upwards. The drawing on the lapel is what I'm thinking of. Hope to get some comments. Thanks!
Hard to tell if the length has changed. Would still drop the button position. Peak lapels look too high from this angle, try having the peak pointing to your shoulder point. That's a middle of the road angle. Not too high/vertical and not too flat/horizontal.
Surprised by how much information and direction you have to provide your tailor.