L - Lips

Whenever drawing lips I have always drawn them the same for every person that I draw because i have seen them as the same without realising, this has made me think that I really need to work on how I draw lips and mouths so lately I have been practicing by drawing many different mouths from different angles and looking at different shapes within lips. I have that a lot of the time people like to focus on drawing eyes and lips are not as focused on but they are just as involved in the human form as everything else. Hopefully after practicing this I will improve my skills in portraiture as well as my general sketching skills. Ive realised there are differences between the size of the top and bottom when before I just saw them as two of the same thing. I have also realised some people have over bite and under bite which changes the size of whats showing on the top and bottom lip.