I think 90% of my gripes with how modern anime looks comes down to flat color design/palettes.
Non-cohesive, washed-out color palettes can destroy lineart quality. I see this all the time when comparing an anime's lineart/layout to its colored/post-processed final product and it's heartbreaking. Compare this pre-color vs. final frame from Dungeon Meshi's OP.
So much sharpness and detail and weight gets washed out and flattened by 'meh' color design. I LOVE the flow and thickness and shadows in the fabrics on the left. The white against pastel really brings it out. Check out all the detail in their hair, the highlights in Rin's, the different hues to denote hair color, the blue tint in the clothes' shadows, and how all of that just gets... lost. It works, but it's not particularly good and does a disservice to the line-artist.
I'm using Dungeon Meshi as an example not because it's bad, I'm just especially disappointed because this is Studio Trigger we're talking about. The character animation is fantastic, but the color design is usually much more exciting. We're not seeing Trigger at their full potential, so I'm focusing on them.
Here's a very quick and messy color correct. Not meant to be taken seriously, just to provide comparison to see why colors can feel "washed out." Top is edit, bottom is original.
You can really see how desaturated and "white fluorescent lighting" the original color palettes are.
[Remember: the easiest way to make your colors more lively is to choose a warm or cool tint. From there, you can play around with bringing out complementary colors for a cohesive palette (I warmed Marcille's skintone and hair but made sure to bring out her deep blue clothes). Avoid using too many blend mode layers; hand-picking colors will really help you build your innate color sense and find a color style. Try using saturated colors in unexpected places! If you're coloring a night scene, try using deep blues or greens or magentas. You see these deep colors used all the time in older anime because they couldn't rely on a lightness scale to make colors darker, they had to use darker paints with specific hues. Don't overthink it, simpler is better!]
CONCEPT DOODLES for an AU I dabbled in with a few friends after the winter king episode but kinda forgot about after the Fionna and Cake finale... I decided to revisit it and explore a little more after coming to terms with everything LOL... So, it's another "Winter King doesn't die immediately after his crown gets nuked" AU, but THIS TIME he's just dying really slowly (like Simon in the Betty episode) and ALSO joins Fionna, Cake, and Simon on their search for magic crowns. There's no logic behind this tbh, we just wanted to put him through The Horrors. And make them all friends. But mostly The Horrors. :) (he only gets to live as a treat, because I think he's funny).
Bonus (old screenshot), because this is still funny to me:
The pile is like… Gideon on the floor, while Frost Kremy and Torbek all lay as close as they can to tThe Heat Source (TM) and Hootsie and Gricko sleep a lil off to the side because they’re a feed back loop of warmth I guess?
Some Bettys!!! I kept on not finishing! But finally did finish today! After remembering they existed and being unable to work on anything else instead of them lol
(Also! In case it’s hard to read, the 3rd pic says: “It’d be fun if she physically couldn’t sleep after becoming magic woman” cuz I’m… evil ghg- I’m that bastard who likes drawing my fav characters suffering…! this isn’t new! This is a known fact about me! Also it /would/ be fun ghgh-)
MORE OF SHARED CUSTODY WINTER! Ah… love watching this perfect little pretty boy go through his ugly cringefail phase, 💕. These doodles are kinda chronological... kinda... top 2 are in babyworld and bottom 3 are obviously in vampworld (also 4th one is a totally legit wow he was there the whooooole tiiiiime edited screenshot, hehe).