Hey, Iwilldoit!
First of all: You have aready been doing it! To keep drawing for three months is a lot and even if your drawing is not hyperrealistic it shows us what you are representing: through your drawings I am able to see what poses these models are doing.
I think one minute drawing, or even fifteen, means abstracting lots of things of your object just as you did, however, when I draw, I prefer trying to achieve the actual contour and shape of what I draw instead of creating geometrical shapes into the contour of my subject. When it's applied to one minute drawings, it means abstraction most of the time, but trying to get the shape's contour is a good way to quick your croquis.
In your drawings that last longer (5-7min) , I have noticed two things: (1) you withdrew your pencil of paper many times trying to achieve the best contour and (2) you put a flat pattern to fulfill hair and fabric. First of all: keep looking to what you are drawing, when you look at two things at the same time you are not looking to any of them (probably you are looking more at your sketch than at the object you are drawing); and, about the pattern in the hair and in the fabric, to creat a tridimensional sensation it's better doing the lines flowing through the shape, when you draw straight lines your drawing gets flattened, it's not a graphic problem, but if you want to creat an illusion of 3D it's better to replicate the way the shadows are, and they follow the objects' shapes.
I'm also not native in English, but I hope you understand me. If you don't I'm avaible to make myself clear. Your drawings are very good, thank you to share your art :)
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