Browbones tend to slope back while yours is the most prominent part, compared to cheekbones. The face also looks kinda flat instead of curving with the typical angle of a skull (like if you see a head from directly above, it's not flat on any plane). Jawbone also tends to slope back and upward because it basically "hinges" at the ear. Highly recommend using life as references (photos, life drawing; phone camera + mirror = lots of self made references)

All in all a good start and great work. Hm how to explain.. the last one is drawn in isometric and not perspective. The lines should get closer to the sides and back. That's not how it looks in nature (Not sure if I use the right words for it, you could Google for it 😅). A great practice for portraits/heads is drawing skulls. You learn the underlying bones and structures Keep it up! 😊