A hand-drawn summer poster in Engpsh could be called a "summer hand-drawn poster". This type of poster is often used to promote events or products during the summer season.
For example, a summer hand-drawn poster could be used to promote a beach party, a summer sale, or a new ice cream flavor. Here are a few examples of how this type of poster could be used in Engpsh:
"Join us for our annual summer beach party! Check out our summer hand-drawn poster for more details."
"Get ready for summer with our amazing sale! See our summer hand-drawn poster for details."
"Treat yourself to our new summer flavor: tropical paradise! Check out our summer hand-drawn poster for more information."