Hey Xanami, glad to see you in the spriter community
Your work so far is very sweet for someone who is just starting out, there is good potential in here that I can see.
If I may offer you some tips:
Don't post sets/sprites in general overlaid on a pitch black background. We can't see the outline that way and it has an impact on the eyes with such a contrast.
Try to use some background that is neutral in between dark and light, or something just a tad to the darker side, that way you will know if your sprite is actually good and fits in all kinds of environments, and it will make it a better experience for the viewer.
Save all of the color palettes you use in a single place and label them with something that they resemble, that way you can slowly build up a huge collection of good color palettes for each material/element that you want to build your items out of.
I noticed you listed me in one of your inspirations for pixel art, which I'm very flattered about, however I did notice a few of your sprites are more than inspired by other people works because they practically are the same sprite, with very minor edits.
(e.g.) I'm not ranting about this, we all have edited other people sprites countless times, but it's distasteful to post them as your starting showoff because it's misleading.
Anyway, keep up the improvements and looking forward to see more from you!