Good.
In the example photo, they have some light coming in at the top right corner. I think you should do the same. So mask your vignette off that area.
Also, I encourage you to add some midtone contrast to the entire background. The easiest way to do that is add a Brightness/Contrast layer and increase the Contrast slider.
No, just inside the hair. You MUST let some yellow bleed into the hair.
But you have to mask with a nice big soft brush. To make it subtle and gradual and plausible.
I think you've gone the wrong way with this. You seem to have lightened your photo, but surely the other photo is characterised by darkening? It's quite a heavy dark vignette around the edges.
No, it's actually quite rare for a monitor's best setting to be sRGB. If Standard gave you the best result, that's where it stays.
Wait, you're scaring me. You had good bright light while comparing prints, yes?