How do I edit the Ninja Cat and T-Rex images?

[Windows Central Question]

I want to create my own Ninja Cat T-Rex image with the images Microsoft provided, but how do I edit them to look to correctly like when the cat is on the T-Rex? How Do I make it so that the cat's left legs aren't showing so it looks like he is riding the T-Rex? how do I make it look like T-Rex is coming out the Windows Logo? The window panes need to show above the T-Rex. How?