Chris,
Some nice images there.
If I can offer my critique (and this comes from my own personal tastes so I hope I don't offend, that is not my intention)....
No. 01:
I like the narrow tonality of this image (my fave of the four you have posted). It suits the serene feel of the image IMO.
I think for this one I would have liked to see the horizon higher or lower and not so much in the centre.
No. 02:
I like the composition of this one but I'm not sure if the WB is set correctly as the sand looks quite red (on my monitor here at work anyway).
No. 03:
I'm sure the "horizon police" will be along shortly to tell you to straighten it....
I think this would be a stronger image if the "Y" made by the leading lines were across to the RH side more (instead of in the centre of the image)....which would probably suit a 3:2 aspect ratio more than a square.
Also if I am being picky (which I am) the framing looks just off-square, which I think it would look better if it was square (1:1)....unless my eyes are deceiving me (which is possible).
No. 04:
An interesting image of Newcastle however I feel the exposure is indecisive in it's intent. What I mean is that neither the sky or buildings (the two key parts of the image) are exposed for correctly.
If the hero of the image is the buildings, these should be exposed for and the sky would be blown out (or a HDR treatment applied to try and have the best of both worlds)....and if the sky was the hero of the image, the buildings would be in sillhouette....but the image seems to be half way between, neither suiting both IMO.
Just my thoughts and I hope you find this contructive...
Cheers,
Dave