what do you guys think about these certificates? what changes should I bring?
give me your valuable feedback.
and also tell me how to create a high-resolution thumbnail.
thanks in advance.
To create high res thumbnail image just increase the resolution to 300dpi when u export that under advance option menu. I think 300 dpi is good enough for thumbnail image.
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Try add some guilloche patterns - I know it’s not easy but makes your work more valuable, elegant etc. 
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Thank you both of you helpful tips. 
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“guilloche patterns” don’t have to be vectors (little advice here )
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thanks
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anytime
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