Welcome.
First of all, I must say your work looks nice. When I first saw these, i thought they looked really pretty, but the amount of color could be reduced. So I though I would edit them a little.
This is where your work made me want to punch babies (Sorry, no offence at all, just a saying). The color amount of the sword was 133!! (including the purple background) That's not ok.
Not to mention the shield with its 390 colors! This is WAY too much for pieces this small.
I did a quick 5-min edit of the sword. Color amount: 12
Compare it to your version. Does your edit look THAT much better than mine? I don't think so. You shouldn't need more than a total of 16 colors to make your stuff look as good as it does now.
Make it look as good as possible with as few colors as possible. THAT'S what pixeling is all about.
But don't feel bad. You're a beginner, and so am I to be honest. You just missed the last part of the rule
Please reduce the coloramount and post the new versions, cuz I'd love to see more of your stuff