Okay I have to admit, this is only an example and not an artwork of great note.  However, I DID enjoy painting it.  On our recent holiday down to Cornwall I did, not only paintings for sale, but also sketching.  SOME of those sketches turned into little paintings in their own right.  I love it when that happens. 
Here's an example of how a FEW added details can bring a painting to life and make it pop.
This is with GOUACHE, so by nature it dries flat and opaque  ~ something I love about this medium ~
My initial wash of colour
St. Michael's Mount, Penzance
and then I added Permanent White 
(not much though)
plus a person on the beach
Is it just me, or does it POP now!
🎨