there probably won't be any super specific tutorials for pixelling anime style stuff, but ya never know. even if there are, i don't necessarily think you should worry about those. my intuition is that you don't have a lot of art background/experience, and I think that's probably what's pulling you down. many people want to dive right into pixel art, but i think that, like every other form of art, you need some general art experience first. Georges Seurat, whose pointillist style is essentially a painted form of the pixel, didn't just pick up a brush and paint La Grande Jatte--he went to a good art school, experimented with style, did a bunch of other traditional paintings, and then finally, after a ton of rough drafts, produced an iconic art piece.
instead of starting pixelling right away, take Seurat's steps: look at general art tutorials (for hair, robots, etc) that certainly exist, ie go to school; do some drawings of generic stuff from those tutorials, to get a feel for the practice; sketch your concept 5 to 10 times on a piece of paper to get a "feel" for it, or create "rough drafts"; finally, at that point, read some pixel tutorials (there are a bunch), and get started on your pixel art.
i don't know if your piece will go down in history like Seurat, but i do know that if you take the right steps, you'll be satisfied
(and if you do have art experience i apologize, but i think these steps still apply)