Here a list of resources where you can download royalty free images
https://www.pikist.com/
https://unsplash.com/
https://www.pexels.com
https://pixabay.com/
https://burst.shopify.com
ICONE
https://game-icons.net/
https://thenounproject.com/ (SVG)
Serious games for agile people
Here a list of resources where you can download royalty free images
https://www.pikist.com/
https://unsplash.com/
https://www.pexels.com
https://pixabay.com/
https://burst.shopify.com
ICONE
https://game-icons.net/
https://thenounproject.com/ (SVG)