That is because, a cell can either have a text or an image , but not both at the same time. As an alternate, you van try populating the value in a separate column and format it to look next to the image.
Seems you are not clubbing in text with image at a time. I think it should work. Is there any chance to share sample applicaiton. And you can split into two expression like one for image and one more play for value of Réalisation. Then look how this is?