I like all of these pictures but, I agree with Izzie regarding straightening of the building lines.
I copied the images into Photoshop and sharpened them just a bit using the unsharp mask. It helped the sharpness considerably.
Generally a bit faster shutter speed might have been better. The standard formula for hand held shutter speed is 1 / focal length x crop ratio. Or in the case of using a 50mm lens on a Canon crop camera, the minimum shutter speed might be 1 / 50 x 1.6 or 1/80 second.
However, your lens might have image stabilization with which you can get away with a slower shutter speed.
Here is the image of the monks with unsharp filter applied
BTW: This is an all-around swell image. Congratulations!