WHAT SITE DO YOU USE FOR PICTURES?????

ok so ive been trying to customize my profile some and i figured out how mostly but like i need to upload the image from the web and i cant figure out how to get my picture with iut paying for imgflip

this is the html im using (stole from w3 lol)

<style>
body {
  background-image: url('example_img_girl.jpg');
}
</style>

basically ive been having problems getting the link

imgflip seems to be the best but again i dont wanna pay to remove the watermark so is there like a secret website or something??

giphy requires an animated picture and gyfcat just didnt work so what else is there??

help is appreciated thankss