OMG! City + Winter = Epic Win. Really I liked the atmosphere you gave to this watercolor painting... it's really captivating I must say that cat and the dog look really adorable looking the city lights
About the lights, maybe some drops of alcohol or acetone could help you to "lift" the color, despite being dry. You know, put a drop and immediately dry and lift with a paper towel. However I recommend you test it before, I wouldn't like that nice artwork could end ruined by a wrong tip.