Besides the previously mentioned perspective issue, this is wonderful. It reminds me of some of the old artwork from the twenties and thirties of such ships. Judging from the scale of it, that would have been one huge airship, perhaps even bigger then the Hindenburg or R101. Very nice.
I love the coloring and the mood, but I think the perspective has some issues. The pier they are standing on appears to be tilted downward because the lines intersect at a point much lower than the horizon you can see on the water.