You dont have to use Tor when you upload the image to imgur. Upload it on chrome/firefox, get on Tor and post the resized link here on the forum.
I've tried imgur in the past but it seems they have banned Tor from it. I only connect here with Tor because I don't trust browsing this forum with anything but a proxy, and it's cheaper than paying for an VPN.
Unfortunately I can't seem to find any host right now to upload images that is both accepted by the forum and Tor.
You can upload the image to imgur with your regular browser and copy the URL to Tor. Or try
https://postimages.org/Well, you wouldn't believe the lengths that some hackers would go to try to ruin your life. Consider that when you upload something to the internet, if you don't upload it with a proxy of sorts (Tor, Vpn...) then that is a point of failure privacy wise because there is a log with your IP uploading that certain file in that certain website, if a hacker could gain access to that log somehow he could get intel on you.
If you want real privacy and you are going to post files here then I recommend you upload said files using a proxy as well. You don't have anything to lose.