https://giovanniluccablog.files.wordp...d-topology.jpg

compare your model to this. your model looks fine but is missing some important loops, such as the smile muscle loop, and the face contour loop. You work from the forehead quads (and extrude them) all the way back to the neck. Look at the picture i sent you and imagine the forehead quads were extruded from the forehead and back to the neck. also you wanna have a circular loop around the ear.

also to make it easier you could make a loop around the nose (nose's definition) to make it easier for you to achieve other loops around that area. otherwice your face from the front looks great. try to get your loops together around the whole face, not just the front !