These are looking great! One thing I suggest, this being a digital platform, is taking photos with some better lighting and make sure when you take them the angle of the camera is flush with the surface of your work. If not, it distorts the image and it’s difficult to judge what your true proportions are. Also, don’t be afraid to darken the shadows and mid tones. It will bring the shapes out much more. It looks like you’re developing a good eye for finding your proportions! Keep it up! I would love to see one with some darker tones.

The different facial features of the face look fantastic isolated but I think the problem is their placement and porportions. Try not to focus on the small detail until the end. Take a step back to see the whole picture every once in awhile. Observe the distance between the landmarks of the face. In the last photo reference the width of the closet eye matches the width of the nose (blue line). The height of the nose matches the gap between the bottom of the nose and the bottom of the chin (green line). The top and bottom of the nose aligns with the top and bottom of the ear (red line). This information will vary between people and camera angles so you find to find these things on your own. its useful to loosely memorize the average ratios (just google face porportions) I also noticed that the chin in the drawing is bowed outwards but the chin in the photo is slightly bowed inwards (pink line). Study the skulls. Observe how they effect the face. More specifically the structure of the cheek, brow, and chin. sorry I kinda ignored the other drawings. They look great just pay attention to the structure of the chin.