Hi Rob,
I've been a web designer until recent for a long time so I can give you a few clews from my experience.
1) Coherence
This has something to do with "a-choice-for-all". There is no bad design, just that when you make a choise you have to "push" it
to the limits.
If you choose to have a text in german and a translation in english, you also have to do it in the menu items.
Example: Über mich / About (me).
As Edu said, Header is different from your picture style.
2) Priorities
What's the most important? The pictures I guess. With such a big banner, or you make it so that it shows
a selections of your pictures, o you have no choise than reducing the heigh.
a) If you want the banner to be the reference point of atraction, you have to do it totaly.
If you want the banner to be just a decoration, you have to "soften" its presence reducing it so the material will
be on the reference point.
3) Usability
In the buttons, the text that move on the right when on rollOver is very distractive and a little brutal.
You really don't need it and a simple color change will do the job.
Inside the galleries, the red color on typo does not match with the gray because it has about the same % and needs to be darken or lighten.
The good point, (and it is smething I'd like to see more) is that I can use keyboard arrows to change the frame: very good.
A mistake in CSS makes the menu layer invade the banner when enter the gallery. Look for it in your css file.
The green arrow that opens the info file is not that clear. ( I found its function after a while ).
3) Design
The footer banner is really, I mean really! distractive. Too much graphic information so your pictures are "eaten" by it.
In fact, because of it, your pictures are in the second plan while the overall design is too present.
Try to be more simple, take out all the unnecesary visual distractions.
The title "Reuthal De" is not emphasized enough, needs clear reading. this is very important. It is lost with the other elements.
The "design by" is useless, unless you are Karin Rashid, nobody cares about it.
If you clean the design and change some details, you will see how much it will gain.
Regards,
Fred.