I think they may be nice images, but they're far too small to provide critique on. Try posting a version which is more like 800 pixels on the long side.
Start shooting in RAW or RAW+JPEG so that you can take advantage of what RAW can do for your pictures...like white balance adjustment and exposure correction in your photo editor. I feel you get much better results by editing a RAW file and converting it to JPEG compared to the JPEG that comes out of the camera (I have a XTi/400D too).