Fans of your photography on Panoramio will be able to easily add you to their Google+ circles, and you'll be able to do the same for photographers you admire.
Yes, to some extent. Go to G+ to change your photo and location, and — as allowed by Google+ name policies — update your name (including optional nickname).
Yes. You may choose a Google+ profile or page. Select carefully, you cannot switch to a different account later. If you'd like to create a +page account, you can follow up with this article.