I am going to show you how to draw a picture you found on Internet the easy and basic way. This is for intermediate level.The pictures are not clearly explaining so focus on the text, mainly :)
Step 1: Select the Picture
I am going to take Big Hero 6 :)
Find the picture on google and save it.
Step 2: Print the Picture
Print the picture in a way that equal or more space is left. I prefer to print it black & white ..
Step 3: Make a Box.
An equal box, actually, just right next to it.
Step 4: Drawing.
Start from the corners. If characters, start from body,then, make the shape of their face and use the lining method for accuracy. Even, use the scale for accuracy OR make lines for once.
You may colour it :)