Thanks for your information. You mentioned 'transformative'. I am wondering what degree of modifications would acknowledge it as 'transformative'.
For example, if I create an illustration from a photo in which a woman is sitting at a cafe, in order to become 'transformative', the...
If I create an illustration image based on a photo I found online, would it breach the copyright of the photo? What if I don't copy exactly. Such as change the original color, add different object(s), or remove some of the object(s) on my illustration.