Before we draw a turtle, try this:
See how many differences there are between the top picture and the bottom picture.
Now get a pencil and paper and using a WhisperLine draw this turtle.
Start with a big circle and add another for the head.
Draw the shape of the neck and head.
Then draw the shape of the shell and add details. Add four legs and a tail.
Erase all unwanted lines. Then add color.