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To my understanding you mean that you've added an image url to your paypal payment form but the image is not appearing.
I've checked on this problem for you and found the reason this is happening is because you are using your imgur account's link to the image and not the direct link to the image which ends in .jpg or .png and such depending on the file type you are using.
Your Image Link:
Updated Image Link:
Should be something like https://i.imgur.com/3hhip9a.png (will open just your image in browser)
Additionally since we use secured pages you'll need to convert the link from http to https otherwise it won't show the image either.
Example Image Direct Link via Imgur:
Where to find it in Imgur (ends in .png)