Create an "ad looking ad" first with a STATIC image. This is to dial in your messaging.

Once that is performing well, split test it against a native style picture.

Once you have determined your winner, try to beat it with a video.

Bottom line - Dial in your messaging with a static picture, NOT a video. A video can return better results but has a much higher likelihood of failure if the messaging is off. Too high of risk to start with it.