Can any one to the best cover photo for facebook( Best pic max $40)

Cover picture for mobile app page
Mobile app( buy, sell 2nd hand things) , Local discussions and events.
All modules we have is Housing, Vehicles, House Appliances, Local Discussions, Events

Need a best edited pic ( pic should include all international people joining hands kind of thing) back ground nice houses and cars.
Best pic will have best price.

Poster :