"Problemas de calidad"

Compare your work with current Stock inventory.  Is yours as good or better than what Stock has?

https://stock.adobe.com/search?k=risotto

Food images must look bright, fresh, colorful and appetizing. 

1. You don't have sufficent light.

2. The fruit flesh is bruised and an unpleasing color. 😞   Use citrus juice to help keep fruit from turning color.

First: Exposure problem, no whites:

The picture is out of focus and the composition is not great.

Second: Exposure problem, no whites:

Where is the focus point? Looks like all is out of focus.

Nice composition, however.

Last: exposure problem. 

The picture does not contain whites.

Focus is not great.  It looks to me that the focus is somewhere on the cloth.

It's a nice composition.

Your main issues are exposure and focus. Exposure can be corrected in post-production (in limits), focus cannot.

Amigo creo que tiene un problema de iluminacion, composición y angulo de toma.

The first image is poorly lit, cropped too close and mostly out of focus.

the second image is underexposed and not well composed 

I like the composition of the third image, but it's underexposed in the shadows, and there is debris in the rim of the white bowl.