Nice to see you creating a sketchbook, here at MP! Good sketches! I completely agree with the suggestion of "Elemento", about the tower! Also, I feel that, the sketch above it, where the structure is placed right in the middle of the frame, with mountain ranges on it's either side, does not feel like a good choice of composition; you might consider, placing the structure more towards either left or right, and make some interesting shapes with the mountain ranges! Will be waiting for more sketches!
HI Elemento
you are right I should spend more time for the detailing of the tower,I will surely do that..
HI Kaustav.
thank you for appreciation and recognizing me yea there is some wrong things happens in composition i ll rectify that,keep watching and commenting