They're all way too blue. Sometimes film ends up with a color cast from developing, which used to be corrected with color filtration on the enlarger, but now can be corrected by adjusting color balance in the scanner preview. You can also adjust afterwards in your processing software, but usually it's better to get it at least close in the scanner. You also need to clean your negatives better or use dust and scratch reduction in the scanner (Nikon calls this ICE).
The images are interesting. In the first, that light stripe over the window is kind of distracting - darkening it or going back when the light is different would help. The last is suffering because the flower looks kind of beaten up, but not enough for that to be the point of the image. The middle one presents an interesting contrast between the stump and the columns, but the bright areas need to be toned down. After the blue is removed, you might consider doing this one in black and white.