Hi Adam,
My thought on this series - you show considerable promise!
#1 - if mine, I'd have that first footprint more to the right of frame, not centred.
#2 - I really like; the hotspots (glints off individual sand grains) don't worry me, nor does the plane of focus, I'd say this was strongest shot of series because #4, also good, is somewhat a cliché
#3 - discussed below
#4 - If this were mine, I'd try a square crop, losing a fair bit from left, some from right, may be a tad from the bottom. The horizon is centred again, which is a shame, but, there's useful content both above and below that shouldn't be lost, the areas that I feel are wasteful, are those left and right sides, hence my crop suggestion. Although you're entitled to
think (but not say) it is a 'crap' suggestion
I thought the third was the weakest - but let's not
just be negative, so I'll say why.
In a series with the others, which have good contrast and fairly consistent WB (White Balance, aka Colour Temperature), it is the odd one out. The composition is also weak as Geoff has suggested. However, I appreciate it may be what you were striving for.
I think we'll need to know what PP software you have access to; e.g. PS CC?
The secret of finding the 'like' is to hover a mouse over the post, only then will you see the 'Mark as helpful' link appear in the lower right hand corner of that post, then you can click it.
Not sure how it works with a tablet though; I guess if you tap somewhere on screen within the post and see if the words appear?
I guess that's Porto, since I don't recall Buckinghamshire looking like that when I passed through some of it a day or so ago!
Cheers, Dave