Glad to see these exercises and more noses! Your values are definitely improving.
I actually meant basic pyramids, the first round was what I had in mind
The main thing I wanted to address was values based on where the light is.
I noticed that some of the values where too close and some were too light.
If you look at the top pyramid, the side facing the light is darker than the side facing away from the light on the bottom one. Try to think more about the light source. How far away is the object from the light? Which sides are facing the light and which are facing away? Keep this in mind when you're shading.
Also some of the values are too close. Make the shadow DARK DARK. I think a lot of people are afraid to go darker ( I definitely was earlier on!), but when you get over this fear your art will get better.
Another think of is presentation. Try to put as much care that you do in these noses into everything you draw. Clean edges are the easiest way to make your art look good. I don't know if you get your hair cut short or if you notice with other people who cut their hair, but if the edges don't look good then the whole hair style is thrown off. So take care of your edges
Your 3/4 noses are looking good and the shading here is nice The only things I did was make the shadows darker and fixed the proportions a little. Don't forget the wings of the nostrils shouldn't go past the inner corner of the eye. Also, the shadow on top of the nose was too flat. Remember the bridge of the nose has a strong curve and all the shadows need to curve too.
Keep it going! Hope this helps.