To clear the images cached in your browser in chrome or edge, click the the 3 dots in the upper right hand corner. Go down to "Delete Browsing Data". Ensure the "Cached images and files" checkbox is checked and then hit delete data.
To clear the images cached in your browser in firefox, click the 3 lines in the upper right hand corner. Scroll down to "Settings", click "Privacy & Security" on the left hand side. Scroll down to the "Cookies and Site Data" and then click "Clear Data". On the dialog box set the "When" dropdown to "Everything" and ensure the "Temporary cached files and pages" and the "Cookies and site data" checkboxes are checked and then hit clear.
To clear the images cached in safari on a mac, navigate to Safari and then select "Preferences". Click on the "Advanced" tab. Check the box next to "Show Develop menu in menu bar". Close the Preferences window. Go to "Develop" and click "Empty Caches".