The WC-E75A Wide-Angle Converter for Nikon Coolpix P7000 Digital Camera is rated as .76
The P7000 lens is 28mm focal length when not zoomed.
So if you use that converter lens you will get approximately 21mm focal length.
(28 x .76 = 21.28mm)
That is just about as far as you can go without getting into distortion.
I looked at your photos and have a suggestion.
Photos number 4,5,6,8,13,16,24 show blown highlights.
Bright areas that have diminished or no detail.
It could be helpful if you looked into HDR Photography (High Dynamic Range).
You can eliminate the blown out (over exposed) areas of photographs.
If you are not familiar with HDR read this:
or just do a Google search for HDR Photography
Based in Thailand, we use our camera primarily for landscape, portrait and Thai food photography. We are about to purchase a new digital camera that we wish to be relatively small, able to capture good pictures for our holiday villa, and especially to be able to photograph indoor / room shots at Gecko Villa.
The Nikon P7000 seems to fit the bill and is available here, but the wide angle accessory is yet to be imported, but should be here in a couple of months.
We would be very pleased to receive feedback from anyone who has used the Nikon P7000 with the camera's add-on wide angle - specifically as to whether it can successfully capture a "hotel room" type shot without excessive distortion, and without the need for professional lighting equipment. The type of photos we take is varied (room shots, landscapes etc) and we wish to improve on the photos we currently have at http://www.geckovilla.com/GeckoGallery/gallery1.html - taken with an inexpensive 3MB Sony.