Oh- is this the water colour of Tennant you were talking about with me? I can see why you're reluctant to reproduce it- looks like you put a lot of effort into it! I love the symmetrical design you have going on ^^
I still think you could do it though- just use a medium you're comfortable with. The picture has grounds to do something really cool with it, and it'd be really good to see how what you've learnt since making it changes it.