Blah and Blah
As most people have stated, you are doing very well so far, especially for your first head ever (?).
-
Obviously, it's not going to be perfect, but we can fix that. Here are some good things I saw in your art:
#1 Decent Concept of Front Mapping: Your eyes and mouth and nose seem to be pretty normal. They are not super long/short or wide/narrow. The eyes are where they're suppose to be and so is everything else. I don't know if you use a mapping template or not during the creation of your textures, HOWEVER, if you are not, totally get one.
#2 Willingness to Take a Chance: First head is usually the worst. Many fresh artists tend to stray away from the complex and creative. I mean, it's good to start on something easy, yknow, just to get a feel of how to use the software and what to do. However, being so shy with art can slow down the creative processes and hinder one from achieving their full potential. You picked a rather difficult palette to color with and a pretty cool design. I like the most that you had a title for your head; it is always good to have a basic idea of what you want to create before creating it. All is good.
-
Now . . . let's talk about what you need to consider improving.
#1 Try some colors that are not too bright, but not too dark either: Until you get a complete handle on the shading/lighting, you should stick to more flexible colors. More so when you are making something to sell, you will need to stick with a profitable color range, such as blue, red, and black. No matter what, just stick to what you're comfortable with (FOR NOW), and move up from there. This is like artistic cold-turkey, not very comfortable.
#2 Use a Higher-Resolution Flat for Your Textures!!!!: I really don't know why your head texture looks so grainy; it's not like you lack a 512 head texture to experiment with (if you did, I would've bought you one). So, amp up your flats, maybe to a 512 or even to 1024x512 (which has become standard quite recently). You will find that mapping will be more precise, and you will have more room to work on details. People love details.
#3 Don't Use Dead End Colors: Never use 100% white or 100% black. You need colors that can be darkened or lightened, even if the change is near insignificant. Yeah, that's it pretty much.
Now go make more art!