Hi,
I would go for a multi-pages/themed gallery, like for example one for the stairs, and another for the gates. Some text would be great too, seeing it as a portfolio with the client desires for a specific piece, the techniques used... Of course, if the client agrees
I would put the languages as header/footer links unless you plan to support many more, you'll see all supported languages at a glimpse, hence one click only. Plus each language name in its own language (English, Español, Català), as the "localized" user will get it directly.
And lastly, I would redo the menu to have the 3 pages at the same level (it seems like gallery and contact are subcategories of home), and replace 'home' by 'about us' or 'who we are'.