Hi Tharegard, It's looking good and I am by no means an expert as I am still working through my first sculpt but here's my thoughts. Things I like are the detailing on the cheeks and running up the mandibles, it gives a really good feeling of skin that is designed to stretch when it get's to roaring. I really like the reptilian approach especially with the crown ridge. The other thing I like is the wrinkles across the bridge of the 'nose' between and under the eyes. The only things I think you might want to look at would be making the skin texture a little more organic and less structured as it looks almost too clean and neat. And this might just be me but the mouth and chin look a little too human. Anyway, just my thoughts from a fellow first time sculpter.