Thank you all for the comments!

Dean:
Thank you for the sites, I will take a look and see if I can find something appropriate for me to try!
Infact, I think I need to do a lot of sketching first to learn to shape the human anatomy properly, so it will probably take a good while before I will get the sketches right, and even longer to paint it all. Sounds like a good challenge!
And as you both (Jeanette Included) suggested, I should probably move onwards to another reference that might give me more to work on in the first place.
Oh and about the nose.. I was suddenly quite amazed when I saw what I had done. I know it has a few details that differ from the photo (the real nose is actually quite "complicated" too as it's a bit "bumpy" and not completely straight), but I think the nose that I made is quite nice anyhow, and resembles her's enough to make the whole painting suggest that it's her.
RJS: You are totally right. I'm a -completely- newbie with colors (and drawing for that matter) that the thought of "using colors that shouldn't be there" is just too advanced for me, as I barely even know how to do simple shading. Also the link that Dean showed earlier about painting showed the exact thing, it had colors being used I only thought existed in cartoons. When I'm more confident in finding the forms and doing them properly in the first place, I might splash in some "random" colors to see what happens.
Maybe with the next portrait that I'll bring up here, when I think I'm "done", you lot can suggest what colors to splash in there if I already didn't..
3lansir:
That's true, the hair does indeed look a bit like hay

I did start off by laying some thicker "clumps" of hair, maybe these were too thin as well and that I overdid the single straws as well to make it as "hay":y as it ended up being. I will have to practice more on this as well, and take some hints from the site that Dean suggested earlier (it has completely photorealistic hair.. like everything else).
Kim:
Well I'm afraid too, I'm positively surprised on what I have accomplished because my general opinion is that I mostly draw like a kindergartener, so it feels like this is pretty good progress for me.
And since this is digital painting, I'm not worried about making a mess, and that I can practice as much as I want without wasting resources. Oh, and being able to paint in bed is quite amazing in itself, which I believe not too many non-digital people would attempt.
J-Lynn:
Thank you for the hairline-tip, even though, as I already stated in this post, I have put most focus on the problem with the depth of the face, so everything else has been left unfinished because of that.
And I'm proud to say that I had noticed before your remark that her left (our right) cheek/chin line is too round and doesn't make the chin stand out the way it does in reality.
Those things that would improve on the resemblance would be to fix that chin/cheek-line as well as a couple of details on the nose.
I'm glad that I had a grasp of these myself, gives me a bit of confidence that I (partly) know what I'm doing.

Also, I also thought that RJS made a self-portrait
*waits for RJS to come back and say "Well actually, me and my brother are twins, so I guess I shouldn't have corrected you" to J-Lynn*
Thank you again for your comments everyone.
This is a lovely place.