Starting this up on more of an upbeat, I enjoy the colors used. You did a decent job on color selection and movement.
The lights and shadows are pretty nice as well. I enjoy some of the sun play on some of the trees in the background.
So On those points, good job.
This has the feel of a speed paint, but you mention yourself that you spent 3 hours on the piece. I feel when laying in color rapidly like this, you should practice to cut down your creation time. This feels like one of the roughs before starting on a final piece. The work is so loose and wild that it just has that unpolished feel. I think that if you were to go back, and use this as a guideline for a more finished piece, you would have a pretty solid piece.
one of the reasons this feels so rushed and incomplete is the mix of line thicknesses, and then the blur tool. Like you laid down the initial color with a big brush and then went back for the details, but never quite finished the detail and got a little too loose with it.
You did a good job of only referencing that photo, but putting your own touches on your piece. So tighten it up a bit. I would like to see a second more defined piece.