Hey there, looking good
One thing I notice here is that you are using a lot of lines to describe the figure, while I don't think there's any right or wrong way about this stuff, I think for faster gains its better to train yourself at this stage by trying to "get the right mark" each time, so as to make your lines more meaningful and then the sketch easier for you to read when it's time to shade or render
Nice work man. Agreed with @snakker, try the tips from this video, it should help improve your lineart:
To understand the steep ramp or stairs, assume the following:
- Everything is made of boxes
- Since all the boxes are parallel to eachoter and you are facing them straight on - we use one point perspective
As for the stairs themselves: try imagining that the stairs are in a box, you would see the box in front of you as a rectangle. Next, if you were to carve the stairs out of the box, it would be like placing many wide, short boxes, one on top of the other, pushing each one a little further back
Cheers!