When should I get an elective 3D/4D ultrasound?

I'm 26 weeks today and I am so excited to see what my baby looks like !! When should I go to get the best pictures ? I want him to look similarly to what he will look like when he's born, but I don't want to wait super long because then it doesn't seem worth it to go. If you have any pics from your 3d/4d US around these weeks please share them !:)

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