Whenever you use images from the web you must give credit to the author and putting the link. To use Ulog tag, do not use images from the web.
Please look at this style guide to do ulogs

https://steemit.com/ulog/@ulogs/the-world-needs-to-hear-from-you-even-steemit-is-calling-now-you-can-answer-create-a-ulog-today-the-u-in-ulogs-represents-you