Thanks Susanne. Yes, I am my worst nightmare. lol. Yes, you are right about the highlight on the nose. Its too light.
I will do another pass (2nd painting) and going over the entire portrait is normal. Adjustments in color values can be done at this stage. The next layer is still opaque but I could play with the transparency. It is still better to do it opaquely at this stage. After 2nd painting, I will be doing scumbles and glazes but very minimal since they tend to yellow more in time.
I will post some updates soon.