This game is beautiful, so wonderful! But just like anything else, there could be more improvements and new, fun features to make it just outright fabulous! So, here are a few improvements off the top of my head that I can think of down below:

We should be able to gift people gems if we wish to. Especially for players who don't use real money in a game to buy gems. Too many other important payments and stuff to make.
The wheel should have trophies placed on some of the sections so we can win some. Trophies are fairly hard to come by if you don't slay in competitions.
For LookBooks, anyone who is off theme in a competition ought to be flagged up to three times before being removed. (Sorry, but you want to keep it as fair as possible for everyone.)
For players who are new, I think there ought to be free welcome to the game gem packages. To help newbies build up their closets and items faster. Those who have been playing longer and built up more items of course will have the advantage in both regular and LB comps.
To buy new models in LookBook, it should be rather cheap to buy your first new additional model. The current price to buy a new model is 599 (really 600) gems. Coins should be allowed to be used for the first model purchase then, transition into gems after that. Up to having to spend about 100 gems to get a third model, then about 200 for a fourth is fair in my opinion.
Items from past events should be given out more frequently in packages. For example, the sketches in the design section of this game should be allowed to be purchased even after an event ends. I see SO many gorgeous outfits I'd love to make and also, save up to design. But I can't without the sketch which is often, unavailable for purchase until that same package comes back around to purchase said sketch for design.
Items that must be purchased with gems in the mystery shop REALLY need to be made cheaper. I have seen so many fabulous dresses I want to buy there, but can't. I'm too gem broke and can't afford them. They should bring back the mystery shop rate drop event more often, and have weeks at the beginning and end of every new month where they have a clearance sale and we can save up gems for the mystery shop gem items and buy, buy, buy!
Gold flower events in LookBook should actually be returned to being able to win GOLD FLOWERS. Since gold flowers aren't able to be purchased with coins like red flowers are every day three times a day, I think it would only be fair that gold flower competitions are actually reinstated as actual gold flowers and not just red ones. I don't always want to buy gf, but am forced to so I can get a higher heart return and buy new things from the heart store. Again, let's make it easier and more accessible for players in this game who aren't going to spend real life money just to advance in a GAME when there are just too many other things you have to worry about paying for in real life. <3
It should be WAY cheaper to purchase all of the LookBook slots in LookBook. 750 gems to unlock the rest of them is quite a hefty price tag for me. Maybe consider reducing it to around 400 even and I'll consider saving up to unlock them all. I am always in need of extra slots so I can join more events and hopefully grab more wins.
Last but not least, the Wish Store items are OUTRAGEOUS on their prices! Maybe devs will consider either having sales for the WS, reduce them gem prices, and maybe even consider making SOME of its inventory into gem items just like the mystery shop does. I love the wish store and have bought some items from there, but they're still HELLA. EXPENSIVE. So let's mark it down and buy it all out. <3

I hope you guys like my suggestions, and you all should post some of your own as well. Who knows? Maybe we can create some change and get this game transformed into something even more beautiful and even more fun for everyone than it already is. <3 So, let's continue to have fun, support one another, and let's keep on Fashion Fantasying. <3