Upload your image to Drive as you would with any file.
In sharing settings, go to 'Advanced' and set the view to 'public' and click save:
On the sharing settings screen, copy the URL of the image:
Go to gdurl.com and paste in the URL of the image and click 'create permalink':
When the next screen loads, look down to where it says 'standard url' and copy the new URL which can be used to embed the picture wherever you choose: