Nice, but for a cover or ad I'd use a bigger texture for the front part of the sub. You may also add some noise to the image to prevent a washed out look. And maybe add some contrast.
You may use TextureWobbler to create an animated texture for the caustics. It's really a dedicated app for this kind of animation.
Using movie footage explosions in the game as well as on ads/cover etc. is ok, probably even adds it some kind of AAA feeling. Here's some free explosions and pyro fx:
http://www.detonationfilms.com/free_stuff.htm
You may use TextureWobbler to create an animated texture for the caustics. It's really a dedicated app for this kind of animation.
Using movie footage explosions in the game as well as on ads/cover etc. is ok, probably even adds it some kind of AAA feeling. Here's some free explosions and pyro fx:
http://www.detonationfilms.com/free_stuff.htm