hey thats a great effort! Somehow you’ve captured a great style to the modelling, rather then an exact replica, you’ve also added a bit of excaduration. This is in fact a very hard thing to do without some artistic knowledge and skill. I cant wait to see more and im curious to see what you end up coming out with as your skills grow even more!
If you are needing some tips on the form, tri’s are usually best left to a minimum in head modelling, but thats always dependant on the situation, but, its like they say, learn the rules, then break them. Also i think you’ll find (if not intentional done) you could probably get rid of some edges closer to the middle of the center and it will smooth round a lot easier. In my experience head modelling is 20% making the base head, and then its 80% tweaking hehe, so if you have time just go nuts fixing a face that could be better or an edge that could loop round better to connect with another (basics of edge loops).
For smick too. Head modelling I also was quite afraid of, edge loops i didnt understand even after making some amount of human and creature heads. I found i just read all the tutorials i could, stacked up on knowledge, tried makign a head in these different ways, one day i joined together the methods to create my own way of modelling organics, it just clicked, and suddenly i could hone my skill. Give it a go, its really exhilerating to see it form, then take shape, texture, and then you can make it come to life, thats a truly amazing feeling 8)