Reaching out a client - advice please

I had today an epiphany for little side hustle - namely making mockups for ecommerce.
Browsing listing of Allegro (Ebay like site in Poland) I found a target / producer:



For sure I will make a better one (thanks to Blender) .

I'm starting to doing it - but I have no experience in reaching out a client with such a product.
Namely they have a dozen of products with same bottle - so from my site it will be some time to do first one, and then just changing stickers and...

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