Your structure looks like you have the basic idea of it, you just need more practice is all. The biggest issue I see is proportion. Even if your construction were perfect, it would still be in the wrong place. It looks like you did a decent job with the "parts" (limbs, head) but didn't capture the overall big shape of the horse. The original horse could fit into a TALL rectangle, whereas yours would fit into a very WIDE rectangle. I'd take a look at Proko's gesture videos on youtube. But basically, start with the big shapes first and then work your way to the smaller shapes. Great job though, it just takes time and a lot of practice

Looks great! Apologies for the wall of text, I'd format if it weren't so late. Your drawing has a great feeling and style to it overall. I have many thoughts which you can take or leave, I like trying to critique people to improve my eye/teaching skills, so feel free to ignore me :) I'd say the mohawk looks a bit too far left from the centerline. The ear anatomy looks a bit odd, especially how the hollow area is right up against the jaw. I also fee like the upper portion of the sternocleidomastoid could be indicated a slight overlap just below the ear, leading us toward the lower portion of it and giving the neck a bit more dimension on the right side.The shapes of the eyes are too similar, which would be perfect in a front view, but don't take into account the roundness of the head, which causes the far eye to be a bit more turned away from us. I'd also look into mouth anatomy a bit. The teeth feel like they are tilting with the mouth, instead of the lips moving around the teeth. If you try to move your teeth into the same position as your character's I think you'll see what I mean- it feels like I'd have to break my jaw to make that happen, considering how the line between the upper and lower teeth is at such an angle. The lower lip and chin indication both look like they are "floating" which suggest either a lack of anatomical knowledge or not knowing how to how to simplify that knowledge into lines. learning about the origins and insertions of the orbicularis oris will help you place the line on the outside of the mouth, for instance, instead of just having a floating c-curve. Hope that isn't too much all at once!!!

I love your expressions! Your characters feel very alive

This is a good start! The left eye looks a bit bigger than the other. I'd avoid doing all those splotchy gray values all over the face, I'm not really sure what's going on there, but it looks like you don't have a clear separation of lights and shadow. Structure and studying the planes of the face will help with that. I think the face might be too long as well, or the eyes should be lowered

It looks really good. Since you said you're looking for critique, there are a couple things that stand out to me: 1) The interior of the cloth, which frames her face, is all a hard edge. That tends to be less interesting and less dimensional than varying the edges. Softening the edges in some places, even losing the edge entirely when the values of the cloth and skin are similar, can be more visually interesting. Especially where the white hood meets the dark hair, a softer transition might be better to avoid creating a dark, flat triangular shape with the hair. That shape calls a lot of attention to itself, distracting from the focal point (the face). 2) The connection of the cloth to the head feels weird at the top of the head. The hood shape feels like we are looking at it straight on, where as we are looking down at the head by a good degree. It's possible that your reference looks like that, but I feel like the hood might come down a bit more towards the forehead. 3) Finally, if you look at the bottom of the nose, the cloth gets too close to it and creates a near tangent (tangent=unintentional focal point caused by lines that touch but don't ovelap). I wouldn't have that cloth so close to the bottom of the nose, because it creates this small bit of space that feels really cramped and distracting. These are mostly just design notes though, you did an excellent job!

Looks great! Overall proportions look decent. I'd say your edges could use work. The hard outline all the way around the eye, hair, and ear really flattens things out. See in this John Singer Sargent drawing he doen't draw the bottom lid. There's also no harsh outline around the top lip. Yours also has a really hard edge where the cheek transitions to the mouth. You can have lines, just be careful about fully outlining forms. I'd also study the asaro head and real skulls to get a better feel for the eye sockets and cheek bones, since it feels like those are lacking structure. Same thing for the ears, they don't feel 3d.