Re: bottle and onion
When I look at the painting, the first thing I see is the texture, and in the second place the painted surface.
I think the texture is too distractive. It leads you away from the real painting, which is very good I believe.
When you create texture as a background to paint on, it should be more modest, more equal, without too exaggerating parts. Because its those parts which will have a distracting effect when viewing the painting.
It would be a different story when you should have created the texture during the actual painting (and not only as a surface to paint on).
Now your texture works as a global veil over the total painting (in fact it's the opposite because it is your painting which is like a veil over the textured surface).
When you create texture during painting, the texture makes part of the actual painting (and would also be more natural).
Hope you know what I mean.
Of course, I think it s also the way you shot your photo, because in reality your textured background is probably less present in surrounding daylight.
Anyway, exploring things is always a good thing. And this is only my opinion on a textured background. As said, your painting is very good.