Make sure you have a good title, description and keywords. I checked Google under 'harrisburg pa photography' and I found you on page 5, but didn't find you on Google Map after 5 pages.
I see you have no 'Description' or 'Keyword' meta tags. Your 'Title' tag is too long (IMO) and I would put the relative words first, like "Harrisburg, PA / Baltimore, MD - Portrait and Event Photography".
For Google Map, do you have a picture? I used my logo/business card. How about some reviews? I asked a friend of mine (customer too) to write a review for me.
I would also add a link on your website to your Google Map listing, several locations (Home page, Contact page etc).
Good luck and btw, it will take a few weeks for Google to index your changes.