In addition to the comments about the width of the nose, it seems like the back of the skull is a bit too small. You also need to look at the eye shapes and the placement of the bone structures of the face.
I was going to mention that if its photo based ref then a the ref plus your sculpt may help with crit, if the fellow has a unicorn horn too then any crits are sort of pointless, it is what it is 
sparky…
i did this quick in photoshop with a smudge brush… you can accomplish the same with a large enough move brush on your model… compare against yours for placement… this should get you a little bit closer to realistic:
[attach=271376]head_sculpt_wip_grey_OSa.jpg[/attach]
eyes moved inwards
nose narrowed and bottom moved up a bit
mouth moved up and curled at ends a bit
Attachments
Hi Everyone, it’s been a few months since I posted on here, well really it’s been a few months since I touched any 3D package due family circumstances and now recovering depression. It was my graduation ceremony on Thursday just gone and that give me the boost I needed to put up my tablet and get back n to zbrush, and so today I’ve started a new character, as having this time off, I want to go back to basic which is practising the anatomy. so here below is what I started 2 hours and 30 mins ago, blocking out the muscles, obviously still a long way to go as he is only on sub div 3 at the min, if you can spot any errors or areas that need a tweak please let me know
Latest update on the anatomy
Usually this forum is pretty good for constructive criticism, but I haven’t had any the last few days
Please can I have some crit so I can take this guy to the next level 
Hey man its good to see the process you are making, but I would have to say that you need to look at silhouettes for this body. There is a lot of curvature in the muscles that are just blobs in your character right now. Mainly the legs and gluts. Always make sure that the forms are there first because it will bite you in the butt later. Also, the face needs a lot of work. If you can check out Ryan Kingslien, he is a great sculptor and artist. If you subscribe to his Zbrush workshops ( no fees or anything) you can get 2 hours of his class for free and in those 2 hours he does a face sculpt in a nice step by step process which is a great way to learn. I learned a lot from it. Keep up the good work and progress.
-Cheers
Hi everyone :)This is a WIP of my latest character and I’d would love some constructive crit ;)I have not detailed his hands and feet yet and his face has basic shapes at the minute,I’m going for realistic looking, I’m unsure what direction to take him at the minute as regards to clothing, but i’ll decide that, when I’m finished with his body
Your making some great progress, but I think the only thing holding back this model is some of your muscle anatomy.
You have some groups looking a tad too large, thus in-turn throwing off the placement/look of the other surrounding muscles. For example, your torso is about a head too long. You can fix this by just enlarging the size of your head, or adjusting the overall torso…
Check out this thread: http://www.theartofanatomy.com/phpBB3/viewforum.php?f=3&sid=3388d7625c891e326f60ecd8331c1560
It is from an old forum that has died years ago, but fortunately it is still up! It has threads for every section you can think of, along with artist doing detailed paint-overs and descriptions of WHY muscles/cartilage/skin forms and looks the way it does.
Hopefully this helps and good luck with further progress!
Cheers for the reply Turner :)The character last posted has been resized to the correct proportions whereas the anatomy study images before that the proportions were quite off :S . Here’s a screeny of the old and the new
Hey Sparky, just stopping by to check up on ya and see how you’re doing! I hope all is well, and I’d love to see some new work 
It’s great to hear from you dude, I have 2 characters on the go at the min, but they are kinda collecting dust at the min 
. Not being able to get a job in the games industry really knocked me, I live in the West Midlands UK, which has the biggest number of games company’s and yet there are no jobs around , as a result I just put Zbrush and all the other software down, and haven’t picked it up for about , well a number of months any way. So I needed to look at my future and decided for a career change and I’m now training to be a fitness personal trainer, I will definitely pick up my Wacom soon and get back into it, I have two characters to finish after all haha