Here’s a shot from Trinidad, Cuba, and the steps I took to put together to turn a kind of blah pic into a pretty nice sunset image:

1. Shoot pic a little underexposed, to maintain the sunset colors. 
2. Open your fave photo editing app (mine is Snapseed)
3. Add a slight HDR filter to brighten shadows and boost sunset colors. Adjust filter strength to avoid too much of a painting look
4. Increase saturation to bring out the colors in the sky 
5. Boost the structure to add definition to the cobblestones 
6. Straighten image, then save
7. Open pic in Instagram, adding a touch of Lux contrast
8. Voila!

You can play with this slider to see the before and after: