Copyright laws vary depending on where you are located, so it would be best to research what your local laws are. Generally speaking, you should always get permission from the artist to use their work. Additionally, many creators of Tarot decks will have specific guidelines on how their artwork may be reproduced, so be sure to check those out before using any of the images. Finally, if you are using the images for commercial purposes, it is important to make sure that you have the appropriate licenses and permissions from the card creator, as well as any necessary licenses from the original publisher.