How do you make shadows properly?

Could anyone please make a tutorial about how to make shadows on SKETCHED IMAGES?

I sketch alot, i know how to shade fine, but i dont really understand how to shadow..

Sorry if this isn't in the right forum. <3

 

u have an object... pick a point for the direction of light

light
object
shadow


so basically the shadow appears opposite the light source and connects onto the actual object. it is a flattened image of the object.

that is quite a "sketchy" description but i hope it helps. it is quite hard to explain :

 

It helps a bit.
I get that it is opposite from the light source. But I don't know the size to make it and whatnot.. And how dark. ><

 

u can make it as dark as u want. that does not matter. it should be about the same size

 

Haha, okay. That clears some stuff up.
Thanks!

 

And don't use dodge & burn. They, really is made the image looks burned. Pick palette instead