What kind of pencil do you use to paint your sketches? Specially the last one, I've always wanted to know about those markers. I think here in my country, I can't find them
oh, about the markers, they are very old, they are called magic color, and are water collored...nothing much good...
But Id reccomend you markers that uses thinner or something else, because they dont wet the paper, so you can pass many times in a place and the paper wouldnt scrach...
i'm sure that i'm not the one who should give u some advices because i'm not a "master" @ 2d (drawing, sketching, painting, etc.) but i'm learning "how to draw" right now & i work on ma skills & i can see that u have some PERSPECTIVE problems like i do so heres what helps me a lot ...