well for not knowing what you are doing you are doing damn well just keep present that some of them are hard surfaces, so try to use the flatten brush more and smooth the edges than you are good to go....endorsed! very well done!
mmmh i don't use zbrush very much due to a s****y ram of the laptop, but i use sculptris a lot.... when you have those little holes in the surface (typical of the crease brush) the best way to correct them is to zoom in on those holes and use the smooth brush (note i'm always talking about sculptris, but i assume that the zbrush brushes are just the same but with a lot more option and stability ). for the edges on the other hand the best way to correct them and make them look as realistic as possible, especially on the metal plates is to use the flatten brush together with the smooth brush....it's just like making a peanutbutter sandwich you have to move the brush on the edges of the plates first (not much strenght or you may risk to ruin the mesh) and then on top of the metal plates..... you can also add scratches with the crease brush and than use the smooth brush as always to remove those little holes.... the effect is perfect and you will work less when you have to make the diffuse....
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when you have those little holes in the surface (typical of the crease brush) the best way to correct them is to zoom in on those holes and use the smooth brush (note i'm always talking about sculptris, but i assume that the zbrush brushes are just the same but with a lot more option and stability ).
for the edges on the other hand the best way to correct them and make them look as realistic as possible, especially on the metal plates is to use the flatten brush together with the smooth brush....it's just like making a peanutbutter sandwich you have to move the brush on the edges of the plates first (not much strenght or you may risk to ruin the mesh) and then on top of the metal plates.....
you can also add scratches with the crease brush and than use the smooth brush as always to remove those little holes.... the effect is perfect and you will work less when you have to make the diffuse....