From a fast click-thru of the video, it looks like you're going for some sort of club-style decor… If so you've probably [Not my scene…] succeeded.
Things like interior design can only be judged in reference to how well they produce an intended effect/mood/feel…
(The linked build is, for example, a castastrophic failure as an 18th century don's office or a modern office )
In terms of "any idea for the future":
if your goal is to get better at decorating, looking at cuilds by players whose ability in this area is generally well regarded (and taking the time to analize the how/why of what they are doing) is an obvious avenue to pursue.
beyond that, 'playing' with various blocks/entities (and the combinations thereof) will give you a better idea of what is possible and may spark some ideas.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.