I did this tank in my free time. The inspiration was the Fulgora laternaria, a winged insect, but with the iterations the shape was changing.
In the process, I worked with 3dcoat at first, for the sketch, and then I did the blockmesh with maya and zmodeler. For the cannon I worked with 3DCoat again, and the exported to ZBrush for did more details withs alphas. Finally I did the renders in Keyshot and added some FX in Photoshop.
I hope you like it!