1st picture:
Try doing a square crop, right now it just doesn't sit right (Rule of thirds, the negative space doesn't really work in this case) and the first candle should be more in focus, try a smaller aperture, what are you at right now? f/1.8? Too big. Try f/2.8. Or is it because the automatic focus was thrown off due to the flame? Try manual.
2nd Picture:
Try a soft flash bounce onto the subject's face as the current lighting is not favourable. Not direct flash, unless you McGyver a diffuser or softbox.
3rd picture:
The eyes are in focus and that's what matters. I'd crop ta bit off the top and left side to centre the subject. The top of the background is a bit distracting, BUT, if the image showed more of that structure leading off into the distance on the left, respecting the rules of thirds for the dog on the right, it could be interesting.