I like tyhe pictures - no really I do but as you asked for critique I will try my best.
Some of the photo's look as though there may be a few burnt out highlights which is sometimes unavoidable but you can help your self with this.
This, I hope, is help and not criticism.
If you are post processing these it may be that by lightning the photo's you have made the lighter areas appear burned out - if this is correct you could try using the shadows/highlights option in Photoshop (if you have it) (elements or full version) which is an easy option (other photo editing programs have similar opitions or so I believe. There are other options within photoshop but they can be more complex.
If it is not post processing and it is the camera's exposure settings then this is easy to work around - here's how I do it
1. check your histogram and adjust exposure accordingly. (alter the cameras exposure value (ev) setting - see 3 below.
2. if yor camera has an option when you view your pictures to highlight bright and dark areas swith this mode on - it is useful especially when used with the histogram. It flashes a warning colour over bright or dark areas in the photo.
3. you could adjust your cameras exposure value decreasing it by whatever amount produces a correct exposure. (I use a Pentax K10 and cannot help with how to do this on your camera - sorry)
4. if you are shooting jpegs try using raw - it can be amazing just how much info can be recovered when processing raw files - I use adobe camera raw and you can recover some highlights and shadows that you could not with a jpeg - I believe this is due to the 'lossy' compression used in the jpeg format which discards information - if you have not tried this then you should - raw files are far better.
And probably the best bit of advice I can offer is practice - nothing else works
Oh yeah, almost forgot - your photo's are great and in my experience some of the ones you will like most won't always be the most technically correct ones but ones that capture a moment or an expression etc - at the end of the day if your photo's make you happy nothing else really matters - that's my opinion - it may be wrong but it is still my opinion.