Here is the cover for the Teenage Mutant Ninja Turtles: Ninja Tribunal DVD that I fully illustrated. If you want to see progress sketches an other stuff having to do with this cover check my blog [link]
Also If you want to find out more of what goes into making the show. I suggest you take a look at the Official TMNT the Animated Series blog Inside The Shells [link] . There you will find a lot of the great production art for the lost season as well as wallpaper of the images I haven't shown here. Its updated every Thursday so check it out.
If your interested here's where you can Pre- Order the DVD [link]