You like to play with light and darkness. That's good! Just, don't try it too much. Sometimes it give the wrong impression of your photo.
Here some of my artwork: (the last one is Anky doing Western. Believe it or not!)
It sure is an art. You might want to re-think your "depression" photo tho it didn't make me think of that at all, more so that that dog was absolutely adorable. I had to share the photo with co-workers. You are really good!