[Sketch with markers, draw a city] Part 18

I started another course on city sketching, this time the emphasis is on markers. The first posts on this topic can be read here:
[Sketch with markers, draw a city] Part 1
[Sketch with markers, draw a city] Part 2
[Sketch with markers, draw a city] Part 3
[Sketch with markers, draw a city] Part 4
[Sketch with markers, draw a city] Part 5
[Sketch with markers, draw a city] Part 6
[Sketch with markers, draw a city] Part 7
[Sketch with markers, draw a city] Part 8
[Sketch with markers, draw a city] Part 9
[Sketch with markers, draw a city] Part 10
[Sketch with markers, draw a city] Part 11
[Sketch with markers, draw a city] Part 12
[Sketch with markers, draw a city] Part 13
[Sketch with markers, draw a city] Part 14
[Sketch with markers, draw a city] Part 15
[Sketch with markers, draw a city] Part 16
[Sketch with markers, draw a city] Part 17

The course is over and I started experimenting. This is another work I did for the final assignment, but it's a bit different. First, there's another blue marker here. Secondly, I do not use a black marker. Thirdly, I leave quite a lot of blue marker unclosed, I do not take it to color. I experiment with colours and the teacher approved it. I completed the main task of the course and started drawing, and experiments are a bonus. I'm looking for my style and my colors for sketching and I want to shorten the time that I spend on one sketch.
So, I start with blue:

I add color

I add parts in gray marker:

I add contrast:

I replaced the black marker with a gray one, so the picture looks not so impressive. Or does it only seem to me?

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