nice attempt, just a couple of comments from this amateur
- the image is a little overexposed
- the building to the right on the first pic might be cropped a bit to tightly, maybe a little more extra space to the right would have been better compositionally
- try taking this shot around the "blue hour", which is the one hour or so period just after sun set where the sky is a nice deep blue (and sometimes purple), even better is when it has rained just before - clears up the air a bit.
Hope that helps. Look forward to seeing more attempts.