Spacing due to round shape of teeth?! (photo)

Just finished my 1st invisalign refinement but I'm still see space between my front teeth. My orthodontist says this is due to the shape of the tooth, that there's contact and if I want to close it further I'll need to file it down which will make the tooth look longer and out of proportion. Is there more that can be 'done' in terms of requesting a 2nd refinement? I see people with perfect teeth after their treatment I don't know if i should settle for this result of ask for more work to be done

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