You don't need to be a photograph editor or rush to any friend to make your photos better, Google+ has inbuild photograph editor, which can improve you photos from "GOOD" to "WOW". And you also not need to make account on other image hosting websites as Google+ has integrated Picasa web albums in Google+ and you can enjoy unlimited image storage online.
Select you picture you want to edit
Click on the "Actions" button below the picture.
When complete, Hit Done editing, and you are done.