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But, there is some parts that not so clear for me: texture scale, ladges, shadows, gaps, slots, gradients this kind of stuff.
I do understand your question and what you're wanting. The scope of the techniques used in getting the effects you want are fairly vast and would be very involved and difficult to explain as a whole. As @polarwoc stated, the best thing you can do in order to help yourself would be to......Ok, say i draw example like from above. How i can do this things: