Lips are crazy, weird shadows

Hi, I am super new to blender and 3d modeling but so into it… anyway I am trying to model a human and I am having a problem which I would like to solve in the very beginning. As you can see eyes and nose are ok but there is something wrong with lips and I cannot figure out what exaxctly. Is there any kind of modifier neccessary or my modeling skill still sucks. Please help!

Found out what causes this problem - few normals were faceing wrong direction, fixed this problem by flipping them in the sam direction as others.