For me it loads prettty fast. No need to make it faster. What especially do you think of?
It´s just a lightbox gallery, done with a composition, isn`t it?
First of all, congratulations on your first site!
You really placed it well.
Now the page load speed of a site depends on various factors and there have been prolonged discussions over this since a long time.
Below are few threads and links which might help you with your query.
Hope this helps.