A few immediate tips that will help.
1) Do edge highlights with the side of the brush, not the point. You just want to catch the raised 'corner' of detail. I can see in the top image you've apparently used the point of a not very pointy brush. Leads on to some other points below:
2) Get decent brushes and look after them. A decent brush has and holds a sharp point. Don't get hung up on size (I do pupils on eyes with a 1) - it's the point that matters most. Good brands - Winsor & Newton Series 7 (excellent, expensive), Rosemary & Co 3000 (very good, cheaper), WAMP (excellent), Broken Toad (seem to be excellent). Don't let paint get to the ferrule. Use a brush soap at the end of a session. Don't get superglue on it.
3) Use the right brush for the right job. Longer bristles make doing lines easier. Shorter bristles make controlling small details easier. A wide tip makes covering broad flat areas smoothly easier.
4) When you do a highlight that's too broad, or too bright, or you want to turn it into a gradient rather than a block, don't be afraid to go over it with the base colour to tone it down and adjust it.
5) Have fun - and remember to finish a figure now and then. It's all well and good just practicing techniques, but these things almost never look right in isolation and it's only when you've finished a model (including getting it based) that you know what it'll really look like. Plus, that's the rewarding bit.
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