图片没有出现在JPanel上？

I am having some trouble getting both the squares I created in the program, and the ImageIcon imported to show up on my JPanel. I have been at this for a while now, and still am unable to figure out what I can do to make them show up, and allows the player image to move. Here is the first piece of my code which is the Maze class:I am having some trouble getting both the squar