Chris Cory's review of this film pretty much nails it, in my opinion. Add in the shedloads of Victorian sentimentality and you have it in a nutshell. The movie positively drowns in this emotion, neatly fulfilling Wain's recurring nightmare.
My takeaway from the film is not that an artist needs 'to see', but that they should ensure that they hang on to their reproduction rights, or whatever the are called in the film. He could probably have been a millionaire, or at least a multi thousand-aire. But alas, it seems he didn't have a proper agent to look after his interests.