It looks alright to me.
What software do you use to make it?
The first advice I can give you is, try to spend 20 minutes every day following a step by step tutorial on Youtube, preferably in the art style you are learning (pixel?) and with the program you use.
Sadly I did a preliminary search on Youtube for pixel art tutorials and most of them are complete rubbish, featuring personalities that are all talk, tips and ‘theory’. No one ever got good at pixel art by listening to pixel artists talk about it. You need step-by-step tutorials that you can follow along, hands on. So you may have to do some searching to come across some decent ones.
Also, if you can find enough decent tutorials to follow along with, by the end of it you will end up with a small library of original assets for your own games (because your results are never going to look the same as the tutorial you are following - at least mine never do).
Also sadly, pixel art seems to be a style that is more difficult to make look nice than other styles - perhaps because there is a pitiful lack of decent tutorials. And the smaller you go, the harder it gets! I use Inkscape/vector graphics and it’s insanely easy to get decent fast with 20 minutes a day, because it is a popular software/format for eveything from game design, logos, and people that make tshirts or use cricut machines, so the step-by-step tutorial resources on Youtube are massive.
Seriously for pixel art your game is looking good so far, and you’re tweaking it here and there according to the good advice given. You will just keep getting better and better the more you do it.
You can also go to OpenGameArt.org or Itch.io and search pixel art for inspiration and to get an idea of what others do to liven up their images, if you can’t find decent tutorials.
EDIT So yeah don’t get too caught up in the art for this particular project. Just do the best you can for now (and it’s really not bad, I’ve seen some really popular games with ugly pixel art) and keep working to improve. The best way to improve is don’t worry about what it looks like, just keep doing it.