A message like that is less about preparation of your files, and more about the artistic quality of the content.
It’s pretty good, but they have to be great these days… as more and more logos become available on the marketplace, the quality standards for acceptance are getting tighter.
Personally, I think the font doesn’t work very well. You’ve also got a gradient on the heart and then flat colour for the wine, so it looks a bit muddled. And as much as you’re trying to replicate how a real glass would look with the slight curve on the base, I feel it looks slightly out of place due to the flat nature of the image.
I’d add a gradient to the liquid, work on the font, and make the glass closer to dark grey than black. Dark grey and burgundy always works well.
Even after that it might not get accepted, maybe the overall concept isn’t right… it has to be commercially viable as well as visually appealing and technically sound. I mean, how many people will be setting up a wine company or rebranding a wine company. Maybe quite a few, but how many of them use GraphicRiver? And even those that do… if they don’t want a heart in their logo, then that doesn’t leave that many buyers. They could remove the heart, but then they’re left with just a wine glass.
Anyway, that’s the way I’m seeing it. I could be completely wrong!