I'm not sure why this legend persists and it is normally shot down here at Signs 101. Simply put:
If you did not create the work, someone else did and has all rights to their work. Even if you can easily copy it and even if it is free to download, the owner of the work has the right to set all the terms as to how you can use the work and how much the cost will be. If you acquire the work without legally obtaining the right to use it as you intend, you are infringing on the owner's copyright. No amount of changing it will change the fact that you are illegally infringing to create a derivative work.
Further ... even if you obtain a license for the artwork, you are limited by what rights are granted or denied in that license. One right that is almost universally denied is to do anything that attacks, confuses or dilutes the owner's rights. This covers the oft encountered illegal grant of rights to the buyer of your product. In short, neither you nor your customer can ever claim any intellectual property rights in the Hyena photo in the work you are doing and both of you will face the possibility of a lawsuit by the owner of the work for an indefinite period of time.