The first image has blown out highlights and dark shadows with noise and very little detail, a white balance issue and is leaning to the right. With just a few clicks in LR, it's quite improved; however you can't really fix the blown out area, and the noise may be difficult to overcome. I really like the concept, and it might have been more successful had you shot bracketed images. The second image also seems to be leaning and the DOF is too shallow, resulting in focusing on the front flank of the squirrel rather than his eye. This can't be fixed.
For the squirrel you will absolutly need the eyes in focus.
Thank you very much for your help!
The first photo has blown out highlights. The overall exposure and temperature need adjustments and you should sharpen the photo. Also, the vertical and horizontal lines need to be straightened.
The second photo is another mater. The nose should also be in focus. The subject should face into the photo and not away. The horizon is not level. The sky is very noisy.
Thank you very much, you helped a lot
@Marichella I like the idea of your first photo but you might think about setting and styling your model a bit better. She appears to have stopped there awkwardly which I understand is to keep her in focus but don’t be afraid to “pose” her so it looks as though she is more in the middle of a stride and perhaps looking up or down or to the left or right just a bit which is more natural when walking. With a model release you can show her walking toward the camera. For the technical aspects you have some great suggestions from others already.
When you take photos of animals, the face and most especially the eyes, must be absolutely in focus. It’s also important to try to separate them in color from their surroundings as much as possible which is difficult as their nature is, of course, to blend in! In this image, there is too much background that has fallen out of focus so it competes with your squirrel as the subject. You can coax some animals to come into your frame area that you control but this takes special knowledge and a lot of patience. Keep shooting!