photobucket is resizing your photos. It's a real problem with photobucket, if an image is a large file it will automatically resize it. Try another image hosting website, such as flickr.
I really like the first - simplistic and yet powerful and good tonal range in the clouds. I also like the 2nd post with the shot of the doorhandle! Would like to see a larger version of that.
PhotoBucket will resize anything larger than 250K and apparently at random sizes too. I've had a lot of trouble getting pics close to the same size. I try and resize everything first to just under 250K before uploading to PB.