Over the past week or so I've not been doing much modelling, but I continued with the quay today.
Earlier this week I made the ironmongery darker and painted the rails and manhole and drain covers. Today, I added more dirt and stains by using an old, worn-out brush to paint and "stab" (don't do this with a good one!

) a few shades of mud-coloured paint in little blotches before quickly rubbing or smudging some of the paint with my finger. Later, I used Army Painter Dark Tone (translucent black) to make more stains in the same way, and also to add more shading along edges and in corners, especially on the stairs. I did the shadows in much the same way as the stains, but using a good brush. Not too small a brush, don't be stingy with the paint and smear it into corners, then wipe away with your finger again, or in smaller corners with a colour shaper.
Here's more of a close-up:
Oh, before I forget: I took a few pieces of balsa, broke, sawed and cut them before glueing them into the water. When dry I painted them to make them dark like wet wood, using first a layer of Army Painter Strong Tone, and when that didn't turn out dark enough, I put on brown ink (from an ancient Games Workshop pot).