Welcome, Gabriel.
It would help if you could include your EXIF (camera settings) with your posts.
First image is, as Paul said, blue. Underexposed, with what I would imagine was the wrong WB setting in camera and possibly mixed lighting sources. I'm not sure if you have a post-processing program, but the white balance could be corrected after the fact with Lightroom, Photoshop, perhaps others.
Compositionally, I think you have too much of his elbow and I think focus of the image would be around both hands. So you might crop from the left, close to his wrists. Also appears a bit tightly framed on top.
Second image is the best. Paul's PS work improved it. I like the out of focus background and the brown leaves complement her hair tones nicely. It feels like she is looking just slightly to the right of the camera;
Again, if you can edit your image, you might clone out the road in the back, filing it with adjacent background.
Third image nicely captures the warmth of the hug. I'd crop closer, eliminating the space over his shoulder. The image really doesnt capture the couple, with his back turned, so I think you want to bring the attention more directly toward her face. Including his right shoulder and a portion of his head preserves the context.
WoW! I didn't expect comments so soon! Anyway, thanks a lot! I really appreciate this!
Thanks again!
Ps: paulhodson, do you think you can be more specific about the changes you did to the image! I have very little experience with post processing and i would love to learn more from you! Thanks in advance!
From a composition and artistic perspective, I like the 3rd best. She appears genuinely happy and its a nice embrace. I would not frame off the top of his head. It would be nicer with a better jacket. And as said above her face needs photoshop work to bring the shine down.
First one - I am not found of because of the framing. The blue cast can be fixed but the framing cannot be. The rule of thumb is to not cut through joints, fingers - you cut his elbow off. Another rule of thumb is to not frame through a prominent feature in a seemingly random way - you trimed off the top of his head. The background behind is distracting - I would try to reduce the exposure behind the subject in photoshop.
2nd one - I don't like the steps intruding on left. I would crop it off. The background should not compete with the subject. Again, I would not frame through the fingers. The noise through the hair does not look good.
Welcome to the forum. I look forward to more posts.