arm and face drawing???

[aeuio]

my arms always look flimsy how do i fix that
and
how do i draw a realistic face?  

[Griffonage]

It would be helpful for the arm thing if you could show an example of your art so people can give you specific ways of fixing it.

For either one of these issues I would recommend looking at a lot of anatomy books and a lot of reference pictures. Life drawing classes, I've heard, help a lot, but often those just aren't accessible. Learning to draw from life will help a lot when you try to distort realism into a more cartoony style.