I've been doing a course for the past couple of weeks and have just learnt about exposure compensation. Today, I had the opportunity to actually play with it! The sun was really bright and from this angle washed these out... I wanted them darker than what the camera chose and with a dark background... mission accomplished!!
My main frustration with this, turned out to be with the RAW processing and trying to get the tones right... not sure I'm there yet!
I think this looks better large with the black background.