Be careful where you get your images from. Most of the images on planetrenderes are not allowed to be modified or distributed for any purpose and thus should not be used.
Exactly. Using them and posting them on other sites can count as redistribution. I would suggest at least posting your sources. You should always link to the original images that you used. It is just good form. There is no reason not to give the original artist credit for their addition to the piece. Otherwise, it pretty blatantly violates copyright laws, to take someone else piece and not give them credit for it.
Most artist on planet renders specifically state not to redistribute their images.
Just try to make a habit of linking back to the original art. It does not take much extra time at all, and will save you a lot of time later defending yourself over copyright issues, or in continuing this discussion on whether or not it is ok. Because it is not alright to use other peoples images without crediting them. So please post all further images with citation.
