Seriously, what is it with Tumblr causing artists to get shittier over time? Her old stuff is more cartoony, but it's not nearly as stiff and doesn't have tiny T-Rex arms at least.
I've said this before, but I think it bears repeating, I think a lot of it has to do with how Tumblr's interface is set up. With the main user hub being a dashboard you can only see if you have an account, user pages outside the dashboard functionally being their own websites, content outside a user's pre-established echo chamber only being found through using Tumblr's broken search filter and a whole lot of luck, and user interactions are practically hidden, it creates a rather glaring pitfall where there's not a whole lot of incentive to branch out or git gud, but a ton of incentive to bandwagon and churn out as much shit as possible in all the popular categories.
For instance, look at something like DeviantArt compared to Tumblr. DeviantArt has its fair share of problems what with the creepy fetish community and there's a definite favoritism towards fanart, but as an interface there were workarounds. Groups gave users an opportunity to find and share their work with people of similar interests, and with a built-in audience you could build up a following without needing to pander to the current flavor of the month, and followers got notifications when you posted shit instead of endlessly scrolling through posts, leaving the only thing you can do to stand out from the other schmucks doing the same thing was improve. And even when DA had its fair share of Dobsons who get lazy and start to decline, they usually only tended to crop up in niche areas where there wasn't a lot of competition. So they also tended to get dethroned the second something better comes along.
Tumblr has none of that for the above reason, so the only kinds of posts that tend to be popular are ones about the flavor of the week and faux outrage/virtue-signalling shit that preys on guilty complexes and victim complexes of others to get spread around. And when a genuinely cute/charming post does get getting traction, it will promptly be torn down by the former faux-outrage folks scouring for reasons to deem it "problematic." In a similar vein this same set up also kinda destroyed traditional artistic advice so you got people refusing to learn color theory because it's "racist" or that tracing anime screenshots is totally a legit artistic learning technique and only snobs say otherwise.
Thus creating an environment where the people only interested in getting clicks are given incentive to jump from popular thing to popular thing, and get extra attention if it's with some sort of SJW "muh diversity/oppresshun" twist to it. In Luna's case asexuality is comparably more niche to some of the other communities on Tumblr, but they're a fairly vocal group of autists who latch onto anything asexual, so the principle is the same.
It's sad when fucking DeviantArt encourages more artistic growth than you.