Much research has examined the development of motion expression, but little is known about this domain in sign language. This study examines how signers (Deaf children aged 5–10 and adults) of French Sign Language (LSF) described clips showing voluntary motion events with variable Paths and Manners. Using mainly iconic structures, children frequently expressed both Path and Manner early on. However, responses varied with the structures used and increased with age for some event types (downward motion, boundary crossing). In addition, serial constructions increased, typically expressing two perspectives (observer and character). Finally, young children did not always provide relevant locative information (particularly with crossing events) but these cases decreased. In conclusion, iconicity partially invites signers to combine motion components, notwithstanding variation in structure and developmental changes observed with some event types.