I don't have AIM, and am not even always available on computer. So I'll try to explain it here a bit more.
The first one is about one of the pictures I saw you using. It's this one: http://www.sxc.hu/browse.phtml?f=view&id=67383.
I can see this has been downloaded already a lot, and I believe I have seen this picture once on another site. I don't doubt I will come across this on other sites as well. And I think you used another (less popular) picture from this photographer also.
Now, these are nice pictures (and a nice girl), so using them like you do is aesthetically pleasing. But when you see them all over the internet there comes an aura of amateurism over the site. Like those free animated gifs you see all over those personal homepages where people just made their first site.
I'm not saying this is already the case, but I think it's good to keep in mind.
The second suggestion was one about the colors you use. It's 99% shades of green. From Veerle's Blog (a Belgian designer, and she's an interesting read), I learned that that can get boring. An interesting technique, as you can read in the article, is to use a couple of variations of the same colour (eg like you did), and spice up the whole with a contrasting colour here and there. Eg Veerle's blog is made out of green primarily, with some red/orange. That's what she talks about in the article: choosing the colour scheme.