If you want to show your image which you have uploaded into PICASA-WEB album, follow the following steps:
Go to that picture. Say the following picture is the one you want to publish.

You need to (see the circled numbers)
1. Click on 'Link to this Photo'
2. Check 'Image only (no link)'
3. Select the size of the photo you want to display
4. Copy the provided link in 'Embed image'
Now suppose you got the link as
https://lh5.googleusercontent.com/-G4FC ... reLink.png
Of course people can click on the link and go to the picasaweb to see the image. But, it will be nice if you can show it right here in this forum, right?
What you need to do is putting that link inside
So, it will look like this (depending on the size you chose):
