Here’s my opinion…
#1 is nice, well exposed and interesting, you caught the sky well.
In #2 the sky is gone, a bit over exposed, there should be an exposure compensation function on your camera that you could use to keep the sky from blowing out. Looks like the sun was very strong.
Some people say that if the sky is going to be white better to leave it out (unless a white sky is part of your style).
#3 is well taken but not an interesting subject/abstract for me.
Martin
btw, Dublin maybe ‘Travel’ for you (I’ll be vacationing in Dublin soon) but you might get more comments is you put these type of shots in for example Urban Landscape. This is a less travelled (excuse the pun) section.