Value Sense?

Now that we have a color/value wheel how does that translate to our painting?  How is it going to help us?  Don't we just see the value and add it to our painting?

The answer is no.  You are the artist and you should be manipulating colors and values to make a statement.  Ask yourself, why are you painting this scene if its just going to be like the one in your photograph?  Even if that photograph is a knock out.  Because if it is so great, why are you painting it and not just framing the photograph.  
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I've told you it is alright to use the black/white feature on your camera or ipad to find the values in the painting as a shortcut.
That works if your photograph is value-balanced.   But if it isn't, you need to make a quick sketch to improve the composition and tell you where you want to use those values. And as an aside, you should be using your own photographs - the ones you took when you were so excited about the subject.

If you are an advanced watercolorist, you are ready to ask yourself lots of questions about what you are painting.   The highest form of expertise in any subject, really, is the ability to evaluate or critique your own work.  Some questions you might ask yourself:

Is my technique as strong as I would like?
Do I have a value sense?  
Do I understand balance and composition?
Do I know how to use color and value to create a mood?
What am I trying to say in my painting?

From my experience, just when you think you are 'advanced' or 'top of the line' is the time when you should be thinking of what to improve, change, or generally 'grow'. One of the great things about watercolor and art in general, is there is always room to grow!