This is a collection of things to keep in mind when storytelling, especially if you are planning to incorporate signs.
Clothing -- Avoid busy patterns, stripes, or checks. It is difficult to follow hand motions against a shirt that is trying to make its own statement. Solid colors work especially well. If they contrast with skin color, that's even better.
Expression -- Remember that you tell the story as much with your eyes and facial expressions (maybe even more so) than you do with your mouth or your hands. In ASL, expressions can change a sign from a statement to a question. Facial expressions provide a context and intent for a sign.
Movement -- Movement is great for establishing multiple characters, showing action, and/or the passage of time or change of space. However, unless you are elevated high above the audience, if you crouch down, you risk the possibility of a large percentage of people not being able to see what you are trying to communicate. Interpreter Amber Galloway Gallego made national news in August, 2019 when her interpretation of rapper Twista's concert stole the show. Twista, who holds the Guinness World Record for being the fastest rapper. Gallego was keeping pace with him, and Twista acknowledged in interviews that her movements were also on par with him.
Know what you are signing -- there are a few signs that you could accidentally make which would convey a different message from what you are trying to tell. (See What Not To Sign for more details)