That finish doesn't look particularly rough to me...
Regardless, if I'm reading "flecks of paint" correctly, I imagine you're pulling dried bits of paint out of the pot. What paints are you using? Or, more importantly, what sort of container do they come in? GW-style pots tend to get a crust of dried paint around the rim, which can chip off, leaving solidified chunks in the liquid paint which get tossed around during mixing. Dropper bottles can develop a similar problem around the tip of the nozzle, depositing those chips if you drag the tip on your palette. In either case, using a palette makes it easier to spot the chunks and push them aside before they end up on your model.
I also make a point of wiping gunky nozzles clean every now and again, as I frequently use sub-drop quantities of colors which requires applying the tip to the palette. Cleaning pot rims is more troublesome, but still possible. Neither remedy lasts forever, but it does cut down on frequency. In the end, though, checking the paint you pull by eye is the only way to avoid the issue and it works best when your paint is a relatively thin pool on a palette.
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