Hi Ana,
Your pictures are beautiful!!!
I also have to say upfront, I'm very new as a shop owner as well, so just like Cheryl, please know my advice is given with great humility as well (I like the way you said that, Cheryl)
I'd say, make sure you have quite a lot more items ( I'm not sure if I'm stating something you already know for a hundred years, so if I am, I'm sorry)
I've noticed that all of the photography shops I like, the ones who have around 150 items (or more) seem to have the most regular business, all the ones who only have 1 or 2 pages of items in their shop, don't have a lot of sales (even though the work they do have on there is really beautiful)
It seems to me that people interested in buying photographs need to see a lot of variety, or they go elsewhere.
Maybe that also makes it easier for people to see what your overall style is.
As for your titles, I think the tags are pretty good, maybe try adding a title that reflects your inspiration for the photo, it gives more of a feeling/atmosphere of being in a story.
Maybe start your description with a tiny little story that you feel in your heart is told by the photo, instead of starting with practical info. (Am I making any sense?), really only has to be 2 sentences, just a setting the scene-kind of thing
I hope this helps you just a little bit. I wish you a lot of business, your photos are beautiful!