Thanks for your comment. Personally I would stick to images which are licensed free to use under commercial purposes as well. If you are searching on Google Images.. you can filter by Licence.
For detailed posting guidelines please read https://steemit.com/steemcleaners/@steemcleaners/plagiarism-guide and https://steemit.com/steem-help/@steemcleaners/why-cite-sources . Hope this helps
Thanks a lot, really helpful :)! I will make sure I know which license is available for which image. Thanks again!