How to avoidbavoid/fix marks like this?

pla 0 5

How to avoidbavoid/fix marks like this?

How to avoidbavoid/fix marks like this?

How I did this one is I used double bladed nippers, then scrape a bit with hobby knife, then used sanding sticks 800 to 1500. I'm wondering if I did something wrong or I need some improvement. Any advice?

submitted by /u/jimbacon04 to r/Gunpla
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