Sorry Sabbath, it must have fallen through the cracks.

You can definitely tell where you have been putting in time.
The pin heads look great and the lines look right.
You have a bit of measuring to do to get the head shape just right. (just went and looked again) I think the cheek on the right, you have rounded out and the photo is round in with a bit of ear showing to the side. (looking rounded out)
I can see on the nose that you have drawn what you see, but as artists sometimes it is good to add a touch of detail to make it look right.
Especially as, if you had the full size photo it would have given you detail in the nose shadow that you can't see on this small shot.
The right eye looks pretty good to me, the left eye doesn't seem quite there, but that may just be because you aren't done shading it.
Over all I think it is a great sketch. I would challenge you to make it a full finished drawing.
If you don't know how to approach a finished piece of art these are the steps to follow ( one of many ways I am sure).
Make a sketch on rough paper, take measurements and drop lines to see that everything is in its place and that you have a very good likeness.
Map out your shading on the sketch.
When you are happy with the sketch and it has all the information you need on it, transfer your drawing to a good piece of paper ( the best you can afford). I use the window method for transfer.
Draw the lines very lightly, as you do not want any out lines on your drawing or indents in your paper.
Next get shading and show us the results.

Also this photo would work really well in
Poe's One step at a time WIP.
The darkness and shading of your photo are very similar to that of Marilyn's photo. So you could feel free to give that a try with your photo. You could then post pictures there and follow along with the other people.