Your room is already doing pretty well. What about it don't you like?

For $100, you could paint (only if you don't like the colour), or get curtains/window treatment and some art. Keep in mind that "classy" means that the art will be properly framed, so that may put much of what you like out of your budget. Same goes for window treatments. Though, if you like DIY, you may try sewing your own. Fabricville often has excellent bolt-ends in their discount bins. A roman blind in a cool pattern could be a nice replacement for your mini-blind and it's well within the capabilities of most beginning sewists.

Btw, your post will get more hits if you embed photos rather than linking a video. Also, if you have a Houzz ideabook, link to it so we can see what sorts of designs you prefer.

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Below are some designs I like

Contemporain Chic · More Info