The ability to create your own puzzles is included into Magic Puzzles VIP. Please follow the link to learn more: https://ipadpuzzlessupport.zendesk.com/hc/en-us/articles/360016033311-Magic-Puzzles-VIP
Press the camera symbol - My photos - and choose any picture from your gallery or take a new picture with your camera.
Please make sure that the access is allowed in the Settings of your iPad:
Settings -> Privacy -> Photos -> Magic Puzzles -> On
You can also create and publish your photos for free using Jigsaw Puzzle Feed