These are just some pictures of what everyone looks like. It is to help you know how to envision the characters as you are reading. If you wish to make up your own images, don't read any further!
Pinkie Pie
Rarity (though without the feathers and glasses)
Twilight Sparkle (except without the robot leg)
Applejack
Fluttershy (with a shorter dress)
Rainbow Dash
Pinkie Pie's Airship