for your first human it is good.
many problems on this head.
every little part of the face is not detailed enough,
the shading you used looks just wrong.
the mapping is not that good too,
the jaw is high, the nose is long, the mouth and ear are small.
when it comes the jaw, we have a shadow under the jawline,
but when it comes the end of the sides of the jawline, the transition is not sudden, same with the back, a line can't fit in there,
again shading problems.