i have pictures or sketches to add...
Concept art can show visual style, characters, and outline core gameplay concepts.
Try to tell your idea with a few simple pictures. While concept art can be hand drawn, if your art skills aren't up to the challenge, try using a montage of photos and other existing imagery to illustrate your game.
Illustrate the player's character, and maybe other significant characters or enemies in the game, to give an idea what the inhabitants of your game are like.
Including reference images for any locations is helpful in quickly showing the kind of environment and mood the game takes place in.
Try creating some simple storyboards or diagrams that show how your core game mechanics work. This can be a very effective aid in explaining how you imagine the gameplay would work.
See drawings of Game Characters from a previous ACMI competition
| Fable 2 (Xbox)|
Read interviews with Game Makers