Which illustrator effects can we use to send adobe.com?

It's impossible to say without seeing it. Generally speaking, gratuitous embellishments & special effects should be kept to a minimum.  But if gradients and shadows are integral to the artwork itself, it should be OK. 

Don't use effects for the effect. 

Hi @possiblePP ,

Please find below two links explaining the requirements for vector arts for submission. I believe that anything not addressed or prohibited in these links and the general guidelines for submissions to stock would be acceptable.

https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/vector-requirements.ug.html

https://helpx.adobe.com/stock/how-to/submit-sell-vector-art.html

Best wishes

JG

Photographer and Nutrition Author