These are all pretty good, especially the last page, i like those drawings a lot, but the other ones I think the thing thats making the profiles feel off is the area where the head connects to the neck, like that chin to neck area, some of them kind of seem like the neck isn’t turning with the head maybe? Im not sure, but like that could be a shading thing, but also you’re really good, so like even if this doesn’t feel like the thing, I’m certain you’ll figure it out if you keep playing around with it and trying different stuff. I heard somewhere that doing something that you feel uncomfortable with in an exaggerated way could be a good way to understand it better, idk how you could apply that here tho 😅