What I find interesting is that because Corona works under such strict restrictions, it has actually made me personally "better" at using vray as well, purely because some of things I have to do, I can translate to vray (while having many many more options), and the results are not all that different, just slightly different work flows. My point is, I think part of the reason why a lot of people after a short time gets very decent results in Corona.. compared to say Vray these days, is just the easy of use. There is no tweaking, no real technical thinking and you get to see exactly what you get within seconds.
Lovely way of working :)
Oh.. and nice image too :D keep it up!