Start from the material you have
Text-to-video leaves the composition open for the model to invent. It is useful when no still has been selected. Image-to-video starts from a frame you generated or are authorized to animate, making it more suitable when the subject, lighting and framing already work.
Write for a timeline
Choose one fictional adult subject, one main action and one camera decision. A short generated clip may struggle when asked to change settings or poses repeatedly. If using a starting image, describe motion rather than redescribing all still-image details.
Review continuity
Check the first, middle and final frames for identity drift, changes in hands, unstable geometry and abrupt lighting shifts. A convincing thumbnail is not evidence that the whole clip is coherent. Start with restrained motion before increasing complexity.
Permission and pricing
Video uses credits; review model, duration and cost before submission. Upload only a still you own or have rights and documented adult consent to animate. Guest mode does not accept files.