Please do your best to not infringe on others’ copyright, in particular watermarked photos from sites such as iStock or Shutterstock.
If you’re asking about how an image is made, you should be including a citation to where it came from.
If you’re answering a question, you should be trying to use either images or photos you own the rights to or one of the many free stock-image websites, such as:
And even those may ask that citation is provided.
As we are a community of designers that wouldn’t want our own work stolen, please show that same courtesy to others by not stealing theirs.
While we do not need to play copyright police, we also don’t have to allow blatant theft.