Tiled image size is 1000px (width) and 1000px (height).
Please create five (5) tiled images following this video tutorial.

1- Go to Appearance – Theme Options
2- On General settings tab, check Enable tiled images
3- Go to Tiled Image – Add New
4- Insert necessary fields
5- Click Publish
6- Repeat #3 and #5 for another 4 images