your pencil work is improving, try to hold up the back page of the drawing so you can see the flipped side of it, it helps you notice any mistakes you have :nod:.
Oh, and holding it up to the mirror works just as fine.
Another good thing to do is practice organic shapes in a 3d form, it helps bring out the 3 perspective in drawings. I'd also do some BLIND GESTURE DRAWINGS,
stare at your reference for a lonnnngggggg time, and draw exactly how you see it WITHOUT looking your paper, it helps