After covering up the necessary areas with touchup paint, you'll need to wetsand the area so that the touchup paint levels off with the original paint. On metallic colors, it's much harder to perfect, but it'll look better than what you have now. Basically what you did was made the pizza without adding in sause, cheese, pepperoni, etc
General misconception with touch up is that you can just dab it on and forget it. You'll need to wetsand to evenly match the paint and then buff out the fine scratches with a polish (like 3M rubbing compound, meguiars DACP, etc). But you'll have to clean up the surface first (wash area, and then claybar if possible)Then you put on a layer of wax to make it pretty

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Here is an example of my car. It has two long/deep scratches on the fender.:
Applying touch up paint. (basically what you did so far)
After wetsanding with 1000 grit and then moving onto 2000 grit:
Final result after polishing:
My paint is just black without any metallic or goodies, so repairing it was easy.