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And you did a good job. You need to put your model on a solid colored BG; one that will contrast with the grey, like black or dark green or something. Then you'll see the little areas that need cleanup. The quick select is a great tool for certain kinds of selections and refine edge can help but is not very selective, working globally on the image. The pen tool is the tool of choice with hard-edged selections and can be used to refine that kind of edge once you have a mask in place. I never said the lasso was a good tool for hair extraction. Heavens, no.

I also said that channel extractions don't work well when the contrast is not great and you have low contrast separations. Channel extractions takes some practice anyway to figure out how far to go with levels adjustments, and some tutorials instruct you on brushing in overlay mode and some don't. And as I mentioned, you can also darken the hair strands including some of the grey to make it look like part of the hair using the burn tool.

Here is a quick channels amsk. I used the eraser to clean up the BG on the duplicate channel and used the black overlay brush to darken the hair. Then I created a mask. I used refine mask and tightened the edge. This did not finish the work and rarely does. I then went around the image and brushed some of the edges (on the mask) to 'erase' them. I di a little of this inside the hair area. Then I used the burn tool on the hair. 

Because it is such low contrast, it is hard to get a satisfactory result. My second picture show my solution to these problems. I don't have the right kind of brush, but they're out there. I sample the colors of the hair, make a layer (below in this case) and brush in a reasonable facsimile. When you have a difficult case like this, that is my recommendation.

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