I too have one of these beachside paintings.
Mine is the usual lady with young girl, and another two further away.
Gulls, foliage, yachts, umbrella - things that seem to appear in most of these.
Signed J Miller, of course.
The oil artwork is quite good, in colour selection, detail and shape of the figures. Obviously someone who can paint well.
Age - well this is not new and has been in the attic for many years.
I would rule out anything Chinese or fake. The painting is huge (1050x775mm), and on 1/8" or 3/16" wood pressboard - one with a stipple sort of finish.
So, overall not a bad painting - work on the sky is very good - a few shafts of sunlight would really make it - but a bit too much of a "girlie" painting for me, but might suit others.
Nick, you seem to know something about these - can you update your email pls? Thks.
John in Australia