Hi Jeannine,
Blue Voda is the best you can have, and it offers you all the capabilities on webdesign.
Answering directly:
Yes, you can allways make any changes to your webpages, even after published - logos, personal details, everything.
You can have galleries in many ways, because there are in BV several options for that.
BV offers you the capability of building great websites - the limit is just your immagination!
Good luck, if any more help needed, please review the video tutorials or keep posting.
Susana
http://www.imperiodocha.com