There are problems with the focus in some pictures. In pictures 1126 and 1317 only the leek is in focus. In addition, the white balance is not correct in most of the images. The details in the lights are also often missing. You should choose a place with natural light to take photos or use a daylight lamp.
Great!! Thanks a lot for your help, Marianne! I found it interesting to focus only the leek but now I see it is just a personal point of view, I´ll improve that. Also white balance I know I use a warm lamp and I am going to move closer to the window, but somedays the light is too strong (Spain..) and creates sharpness and shadows.
What do you mean with the details in the lights? could you explain a little bit more?
You can use a diffuser against the strong sunlight. Just try a piece of white fabric. I mean that the lights are blown out. Take a look at the sheep's cheese, or the larger white areas in some of the pictures. Look at this histogram. There are problems in the darkest and lightest tones: