Do you ever get painters' block? You're not sure what to paint next, and nothing seems to be working? I'm lucky, meeting so many interesting people and creatures (yes, it's often those wild things out there that give me so much pleasure when I'm out sketching), that it never seems to bother me. If you are finding it hard to get going again, you can try working on different surfaces - tinted papers, perhaps - or a different medium for a while, to trigger new sensations.
Think also about changing subject matter. This can be totally different to your usual work, or simple extending it in a way, such as adding wildlife into the middle distance of your landscapes, or more detailed figures than you normally paint. While I mainly paint landscapes, the impact of stunning wildlife stumbling into my scene (and sometimes getting a bit too close for comfort) has encouraged me to paint more wildlife. Boats and the sea are also favourites, bringing a pleasant change to inland scenes, and I love doing figure work in various forms.
There tends to be a lot of detritus lying around in a scene like this, but you don't need to put it all in: some of it can either be simply suggested vaguely, or you could leave it out altogether. As always with a complicated scene it is vital to do at least one studio sketch before the painting, to work out the optimum composition. Consider also keeping the background as an almost monochrome as I have done here. This will further throw emphasis onto the foreground.
Unfortunately Images of the South Wales Mines, the book that resulted from my mining paintings, has long been out of print, but you may be able to get a rather expensive copy secondhand. Most of all, don't let that painters' block stop you - we all get a little stale at times, but trying a different type of subject is often a good way of rejuvenating your artistic impulses.