About a year ago I did a logo for Mocsie. They wanted a picture of David slinging a stone. Originally we were going to do it from Goliaths point of view, looking down at David. I felt we would make David feel stronger if we were actually looking from below him. I also made sure his feet were planted apart to give the overall drawing a triangular feel between his feet and head. Upward pointing triangles give a drawing a strong feeling. Reference was googled for the positioning of the arm and wrist while using a sling.
I did this with the pen tool in photoshop. Vector graphics are the best to use when creating logos.