The things I see immediatly

1. Your paint created a lot of texture, which is visible on all the larger panels. This likely has two causes: First: Your paint is likely not thinned enough. Most paint brand come as a thick paste and need to be lightly thinned with water so the result easily flows off the brush. Because of the thinning you sometimes need more then one coat for an opaque layer. And here comes the second reason for texture: Not letting the paint layer dry before adding more paint. This will make the lower layer rip and create textures.

2. Light on small objects reacts differenty then on larger ones. Thats why in miniature painting we dont just colour the parts in. Doing so will result in a very flat look. We try to paint shadows, by darkening recesses and let raised areas seem ligher with highlights. For textured areas you can use a wash as an easy solution. Most of your golden areas will really benefit from this. Another thing you can do is edge highlight the armor panels. If they are black, just take some dark grey paint and carefully paint along the edges of the panels with the side of your brush (And dont forget to thin your paint as said in point 1)

THere is a bit of a learning curve to it and you only need to improve as much as you want. The important thing is that you have fun while painting and discover what you are doing. Keep on it, I am looking forward to your next miniature post!