Well, first looking at your site I have to say it's very...bland, the layout and colors
For layout ideas I would recommend googling for "html templates" or something like that, and just browse their free or paid templates, not to buy, but just to get ideas of the layout of a basic website, then pick some you like and try and model their ideas
Color-wise, as elsaspet said, gray is bad, I would go for a brighter color, even white is a good choice. Then google for "color scheme",
here's the first result, and play with some colors you like, I personally prefer the "Triad" option, as it gives you two similar colors, then two contrasting ones to use
I would also look into creating some sort of logo for your company
The way the gallery works is a no go for me, and probably most people, you should integrate the single images into your website, not just have links to the photos, you can say that's a lot of work, and it may be, but it still looks bad
Aside from that you have a good start, you have a consistent layout and navigation, which is definitely good thing, looking forward to seeing more