MinPic is one of my oldest* websites *which is still online
There was a web based app but 2016 I released a native iPhone and Android app for better usability.
The user can make a photo or use one out of the device’s gallery. He can paint on the image and upload it to the minpic server. Already uploaded images can be edited too. Buttons to share the image on facebook, twitter, whatsapp, and by email and sms are available. One click on the X and the image is deleted.
The app is free and could be used without account, but also regular minpic accounts are available.