If i get a image and i decided to cancel it later on. Would that mean the image i purchase has to be return or it my image forever?
You can keep purchased images forever. If you have, however, still images to purchase, those images will be lost after canceling. So the rule is first to buy all the images that you can buy and then cancel.
Please note that the 30$/€ plan is an engagement for one year.
Thanks for reaching out to the Adobe Stock community.
In addition to Abambo reply, I would suggest you to download all the assets prior to cancelling your Adobe Stock subscription since the downloaded images always remain in your license history.
You can use your available licenses as long as your subscription is active, but you forfeit any unused licenses upon cancellation of your subscription.
Also, please refer to Common Questions about plans, purchasing, and availability, Adobe Stock and Adobe Subscription and Cancellation Terms | Adobe for more information.
Feel free to update this thread in case of any additional questions.