This is going to be an illustration that represents a beer we make called "Thunderball Stout". It's a dark, rich and somewhat strong beer, so we'd like that to come through in the artwork.
The beer is called Thunderball because the first time we brewed it, there was a thunderstorm moving into the area (we were brewing outside). As we brewed, some large, dark clouds formed over us and there was lots of ominous thunder.
For the design, I'm thinking that a big, dark, ominous thunderhead cloud would look cool. Maybe a little bit of lightning, but not too much. In general, I'd like it to look dark, menacing and powerful. If you have other ideas, feel free to be creative. After all, you're the artists, not me! Try not to use photographs of any kind. I'm not going for a super-realistic image. At the same time, I don't want something that looks extremely "cartooney" and childish. See samples below for the types of art that I like.
The illustration MUST INCLUDE the words "Thunderball Stout".