Pro Bono RPG illustration - VERY rough sketch

Last week my good friend Steve asked if I would be interested in doing a piece of illustration for an RPG article he's writing. I'm always interested in things like that ! 

What I'll be doing is a piece to support an idea of a radio station transmitting the voice of a dead god. 

I've been playing around with some ways of doing that - and I think I hit on the general direction I'm going to go with it yesterday. 

It's VERY rough at this stage - but here's the final base sketch : 

I'm excited to see how this turns out in the end !