Turtles' legs attach in the same manner as those of lizards and frogs. Conceive of the turtle as a lizard with a round head and a shell (carapace)
Turtles
Turtle tucked into its shell (worm's eye view) Turtle seen from overhead (bird's eye view)
.. about one-head length out of the shell.
Draw a lizard.
Add a carapace to its back. ---For the under drawing, sketch the turtle on the paper's underside. Next, trace the under drawing using a light table, carefully filling in the details.
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Correct proportioning: The carapace is four heads in length.