About the pictures used: My cousin made an exchange of two months in Peru, I "hired" her to take photos for me, especially when she was in old ruins and Machu Pichu. I have the folder of all the original photos I used to create this premades.
Don't claim as yours, because it is not!
You don't need to ask permission to use, but I would love to see you crediting me with a link to this page, I want to see the result of your work.
You can use your artwork with my stock outside DA.
Commercial use it's ok, afterall, it's your work!