My urban sketching

The sketchbook has a strong sense of consistency, and the small landscape studies show a good variety of subjects and compositions. I don't think you need to add much more color; the limited use of color already works well and keeps the sketches cohesive. Some pages could benefit from slightly stronger contrast and darker shadows to give the drawings more depth. The compositions generally feel balanced, although a few sketches have a lot of detail concentrated in one area. Adding a few more close-up studies, people, animals, or everyday objects would also add more variety to the sketchbook.

I tried generating an image that looks more lively and colorful. You could also use markers instead of colored pencils. the sketch itself is beautiful, and adding more color would make it feel even more vibrant.