Other people’s artworks are not your textures.
This is important. More times than I can count, I’ve been happily reading a tutorial, excited to reblog it here, only to find myself running into a “now we add the texture!” step, where someone adds a painting, a graphic from Behance, a copyrighted piece from someone’s Flickr, etc. to their edit and calls it good. This is not acceptable.
Part of the problem is that texture makers on Tumblr are prone to going to Pinterest, Behance, Flickr, and other places where art is posted, taking copyrighted works, repackaging them, and redistributing them as “textures”–often with the caveat of “Don’t claim as your own! Don’t redistribute!”
I’ve been tripped up by this horrible practice myself. Once I heard of it, I went through texture packs I’d downloaded from Tumblr and reverse image-searched them on Google. Half of them had been stolen from Behance pages and artists’ galleries. This was stuff I’d used on my own graphics, thinking it was okay, that I was making use of a resource created and shared as such–when really it was stolen art.
Be mindful. Look at the resources you’re using. A good rule of thumb is, “Does it look like a finished piece of art already?” If it does, it wouldn’t hurt to reverse image-search it and make sure you’re not using someone else’s art. Be as respectful of others’ art as you would like them to be of yours.