It looks like it might be quite a nice drawing but it is a bit blurry, one tip I would share is about the composition, which, in this case, has been constructed through optical means. When photographers snap buildings like that, they often (not always) avoid lines parallel to the horizon by shooting from a corner. The reason being to avoid noticeable curves on lines offset from the centre, You don't have to do that with drawings, you can construct a composition through manual perspective, whether you choose to do so depends largely on the scale of the image, the curved lines can be effective at small scale but undesirable in anything you have to stand back from. Anyway, as I mentioned, there are hints that it's nice drawing, I hope you have luck with the sales.