There are some nice photos in there. However they are slightly overexposed etc. which is easy to fix in photoshop. Basically programs like photoshop are a "digital darkroom" and it's perfectly ok to tweak your photos in there a bit to get the most out of them.
I'm not talking heavy handed full out photoshopping but a bit of contrast, curves, levels, colour balance etc. adjustments can often make a photo.
As an example I took one of your photos (I hope you don't mind) and tweaked it a bit. I just used a slight curves and levels adjustment to bring down the slight overexposure (or what I see as overexposure anyway) which then brings out richer colours. I also resized to 640px max width because I think that's the biggest that's allowed on this site.