Keep it simple
Sometimes, ads can be created in a simplest form by capturing the complex concept of imagination. Simple ads can also reach and appeal to more people, it connects with the customers' direct experience. So, keeping things simpler (both message and design) can be one key to successful ads.
(Image: Lego by Blattner Brunner)
Use Visual Metaphors
A visual metaphor represents one concept by comparing it to another concept. It requires a clear and obvious visual for consumers to understand in an instance.
(Image: Elter Drugs by AW Nazca Saatchi & Saatchi, Caracas, Venezuela)
Show, Don’t Tell
One thing you should always remember, never explain something when you can show it. Visuals are very important, it can give the audience your direct message. Don't be afraid to show off the features and ideas that surround your product rather than telling people about them. This kind of ads create a much stronger and lasting effect.
(Image: Curtis by Catzwolf)
Use Recognizable Symbols
People usually get the message you want to communicate to them easier by using recognizable symbols. It gives your ads meaning and it creates strong, quick and fairly universal message.
(Image: Capacitate by Koenig & Partners)
Say It In A New Way
Find a new way of presenting the message, see the product you want to promote and list out its function. You can fuse specific alignment and composition, find relationships and forge a new path and create it in a clever new way.
(Image: Extra by BBDO Dusseldorf)
Generate An Emotional Response
Play with peoples' emotions, this tactic makes your ads memorable. It produces reaction and engagement from people, evoke a sentimental and somewhat upsetting emotion in consumers and discuss how it does just that. Not only a visual, but the message can also add more emotions.
(Image: Unicef by Lowe Digitel)
Make Them Stop And Stare
If people don't spend much time reading, then make the visual communicates! Create an image that required consumers to do a double-take in order to understand. This kind of ads invite your consumers to do a double take to see what they’ve missed.
(Image: Colgate by Y&R)
reference: https://www.canva.com/learn/advertisement-design-tips/