Pic #1 - I'm more intriqued with the rocks than the actual cat. It becomes a bit of a distraction I think and better cropping/framing of the subject could really help this shot. Also, I think more contrast could help with the shot as well. It could really bring out a nice sharp, detailed image. Curious to know what your camera settings were for this?
Pic#2 - Absoluetely love the reflection of the sun off the water. Not sure how to prevent this, but there seems to be a bit of a haze in the background. I was going to say to cut some of the sky out of the shot as it becomes kind of dead space, but then your picture wouldn't be balanced and I would hate to cut any water out. This might be a case of splitting this into two photos. One with the sun reflection, the other with the boats.
Pic#3 - I love architecture, and really like the shape of the dome next to the sky. But what actually draws my attention are the buildings at the very bottom of the photo. I love the symmetry, color, and flow of how they work together as a single continuous structure. If you were wanting to include them in with the dome, then I'm curious to know what was below them as they just seem cut off. I'll be honest, at least for me, the lion statue does nothing for me, but others may feel different.
Overall your best composition is probably the last photo, but the overall best photo is probably your first.