Anime starters
The skulls are the basic in every drawing and should be takin in consideration when doing so.
This how you get the main persona when doing faces,it forms from the skull. 
These are different types of mouths that can be used in expressions.
Here are some basic shapes that take place when faces need filling in.When adding eyes make sure you have room in between the two eyes for another one, with this done its perspective looks believable.
Here are cross lines where the person is looking at.This is to create the field of position for the person.
Here are the legnths in which bodies are formed.Notice on the left (normal),the body is 5.5 heads tall,while the right (chibi)also known as baby is only 3 heads tall.
Notice how the draft of the body looks, i call it the "stick man" this helps you figure the position and standing point on the person.See in head section 2, is the chest area, and in 3 is where the hips form, and in 4 the knees take shape, in 5 the calfs form, and last but not least 5.5 makes way for the foot.