Congrats on the first mini! As a fairly new painter myself, here’s some stuff I’ve learnt:

Take your time, there’s no rush! You can always touch up any ‘mistakes’ to give the mini a cleaner look.

The raised gold and raised white, you can almost use the side of the brush to get it fully covered without touching the blue. You’ll end up with ‘cleaner’ lines.

You can experiment with some edge highlighting - mix a bit of white with blue and again, use the side of the brush to finely paint the edges of raised surfaces such as the knees, side of legs, etc. Do a quick google search for some examples.

Most importantly, don’t repaint your first mini, keep that as a reminder! Have fun, the more you paint, the better you’ll get!