UML Graphic Turtle in Java

I need to create a Graphic Turtle model before programming.

For now, I have this UML:

Have you got some ideas to add like design pattern? (For now I'm using Factory design pattern and I will use MVC) or maybe to improve my UML?

I don't really know what I can add to get my Turtle efficient, performent and right.

I'm thinking to get only one JFrame with 2 general Panel (the display of turtle and the command line) like this example:

Actually, my turtle is based on rewriting code from L-System but anyway.