Nice use of an everyday object as an abstract to create an interesting photograph. The focus is good and DOF is on track, could have been slightly deeper. I think a deeper dept of filed would of made it more interesting giving more detail and sharpness around the edges of the brush bristles more than just one or two deep in the photograph. Lighting is good and your photograph is definitely high contrast. Your composition and POV is good against the smooth background.
I hope you find this critique helpful. Keep up the good work.
Nice 'texture' macro. Would prefer the focus crisper in the near-field. Tonally not too interesting, but intriguing all the same. A hairbrush, right? 9.