We draw length and width approximately, measuring arm-distance distance on a pencil and postponing it on paper, only focus has to be at identical distance from the monitor screen. So we thin lines draw the central part, a stem slip and a trunk. The image increase so press them that to make out everything.
Draw with the same way a butt, the pistol handle, the trigger device and shop.
Further more detailed portrayal will begin.
And on postdock it is possible to shade some areas a few.