Thank you all for replying. Indeed, I have some troubles with white balance, mostly because those pictures are taken with my phone. My portraits are not portraits, this I know, but I kind of liked the shadows.I am actually buying a DSLR in 2 weeks, and I just wanted to know if I have any good photos at the moment.
Also, the pictures look yellowish because I had set the camera to cloudy mode, and I liked the softer, warmer colours.
Thank you all once again!:)