Stage 6 - And right eye.
Stage 7 - I then went on to block in the rest of the skin tone more accurately. I personally find skin hard to draw with a tablet atm, probably because I don't use the brushes available very well. I find it tends towards looking too smooth and plastic.
Stage 8 - I then made a start on the hair (I rubbed out a lot of the original blocking in before I started the hair, as otherwise it tends to spoil the edges). As with the skin, I feel that I don't really use the photoshop brushes well here. I do the hair simply as lots of individual lines, trying to follow the general shape/tonal values, which is a very laborious and not too effective way of doing it. Any advice is more than welcome.
Stage 9 - I did some detail work on the earrings. I normally cheat when I'm drawing none-organic objects like these, and rule some lines across to get the proportions correct. If I don't, I usually find they're obviously out of proportion.
Stage 10 - This is where I've got to so far. I slipped in a scan of some linen as an "overlay" layer to give the picture a little texture. I will probably continue to try and work a bit more detail into the skin and hair, and work the features slightly to try and catch the expression better over the next few days if I get the chance.