Hallo Markina. This is a nice theme and I like the framing with the boy occupying the right part of the photo. The image is under exposed, but this isn't the main problem here - you can still correct this, since you are shoting in RAW. The problem is the focus. You have used a wide apperture and that means that you wanted a very narrow depth of field. This can make interesting images, but can ruin them too, as it happened here.
You must be careful, where the focus mark on your eyefinder is. In fact your focus here is in the wall behind your subject.
The dog and the boy are not in the same level, so you need a wider DoF to capture them both in focus - an aperture of 5.6 would have been suitable here. If the lighting condition were pure, you could lower your shutter speed to 1/125 and raise your ISO.
All this is difficult to think about, when you're shooting street scenes. I would suggest in these cases temporarilly to shoot in auto mode, until you become more familiar with your camera settings.
All the best and keep shooting!