Feeling a bit stupid here. I've only just noticed the zoomable link. I've been struggling trying to see detail with the little one you originally posted.
Anyway, just pored over it and it's even better than I originally thought (and I can see where Lowry might have got inspiration with all those little figures).
There's actually quite a few windmills on there, I think I can even spot the Walton one.
And trains, yes, I can now see Exchange is on there and the elevated approach lines, even the Leeds Liverpool Canal, and you can even follow the line out to the junction just before Bankhall when it splits and the Liverpool, Crosby and Southport Railway line peels off up towards the North whle the other part, the shared Liverpool, Ormskirk and Preston Railway and the Liverpool Bury Railway heads off inland.
Same with ship building being very much evident in closer detail, I can clearly see hulls being built up and on both sides of the Mersey.
One anomaly I noticed and is a bit puzzling, perhaps a bit of artistic licence is at play or the painting wasn't completed until later when it was included, is it looks very much like the Great Eastern is parked up in the Mersey (see 3rd snippet). That distinctive 5 funnel layout and the mast arrangement.
I know she visited Liverpool in 1861 and eventually met an ignomous end on the cast iron shore in later years, but she only did her maiden voyage in 1859 and as far as I can see, didn't visit Liverpool until 1861
according to WikiUpon Great Eastern's return to England, the ship was chartered by the British Government to transport troops to Quebec. 2,144 officers and men, 473 women and children, and 200 horses were embarked at Liverpool along with 40 paying passengers. The ship sailed on 25 June 1861 and went at full speed throughout most of the trip arriving at her destination 8 days and 6 hours after leaving Liverpool.Including the over 400 crew, that's around 3000 people packed on her for that journey, amazing when you think of it.
Anyway, snips attached.