I think you're doing great, you have some nice shading going.
The face has some problems with dimensions, Brenda has some great lessons for faces, check out
this one and there are several others as well.
You will also want to start trusting that your shading is going to give you form. So you will want to be bolder with your darks and start to take out the outline lines on the drawings. Also don't be afraid to put in some background to help get your form.
The adult hand really shows how great you are doing with your shading. I look forward to seeing more!