Thank you so much for the reply. Yes, I have a server- I have already started using Wordpress as my CMS, just haven't gotten the site anywhere near done or looking as I want it to. It is not meant to be a blog for the most part so I am trying to customize that theme to take the blog look away. Then I uploaded Zenphoto to my server. The regular site is at elviza.com The Zenphoto gallery is elviza.com/experience. As you can see, I uploaded three photos. The first one automatically filled in that larger 'header' square that used to say Zenphoto, and immediately below it shows a smaller version with the same bad cropping. I couldn't figure out how to fix/change either of those. I did crop the thumbnail for that same photo and it appears on the cover of the album just fine. I also didn't ask for that elviza.com up top, and when I did try to make the link that goes back to my site it didn't work anyway so I got rid of it.
If I cannot change the background, then I will switch to a theme that offers black or dark grey, but my intention had been to somewhat match it with the main site. Whatever the case I'm just frustrated because I'm usually pretty good at figuring stuff out and yet at every turn it seems even the simplest things are causing me to have to go searching around for how to do it. I don't mind researching and learning, but so far the number of hours I've spent relative to the current end result is not good at all. I mean, what I have up is better than nothing, I guess, but I've probably spent more time on it than my old site and that's including all the updates over the years. I had my choice of background, font size and color, photos and videos, multiple pages, etc. and I was much less tech-savvy when I put that together so I'm feeling kind of dumb right now.
I had started off this time around with a program called Sitespinner which had some great reviews, and before I'd gotten very far in learning it my web host said he didn't recommend those site builders and I should try Wordpress or Joomla, so I was taking his experienced advice, especially after seeing some great sites that use WP (including in the Zenphoto showcase), not realizing that many of these examples necessitated writing your own code or knowing it well enough to make a bunch of changes. I know some html, but probably not to the extent needed to write my own site. Anyway, sorry for rambling- I will look further into the theming tutorials, just want to make some progress sometime soon as I really need to get a professional-looking site back online again.
Thanks again for the help!