some simple tips i can give you right now; the nose is closer to the mouth, and is not in the center of the face
the eyes are drawn closer to the center of the face, and the nose bridge starts from the eyebrow line
human ears typically start at the eye line, and end where the bottom of the nose is (imagine an invisible line)
i'd red line it for you, but i can't find my drawing tablet right now
your hands and neck proportion look pretty good : )
basic body proportion

drawing side view (realistic)

simpler vers (anime)

just look up anatomy tutorials, and
always use references