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There are a few thing that can be done to get sharper edges.
- First off wet you tools when you work. (Water, saliva, oil, vaseline, and so on)
- Then you can touchup your work after it has cured for one or two hours to sharpen the details.
- You can sand and file GS if it is properly cured to get sharper edges - especially if you mix in some harder cureing putty like milliput. Just use a very fine grit sand paper.
- Also keep a close look at the tools you use. The sharper the tool the better they are for the edge corners. (Maybe even use a knife.) To get smooth egdes along a longer area you can use clay shaper rather well to get it more even.
- Working in layers helps for getting smoother details. You don't risk distending the surface if it is already cured. (And sanded if it was necessary)
- The last two pictures are using pressed details. The idea is that you build a negative mold by pushing in those thin lines in your master(as well as bits and other sculpted details). Just use some more hard curing putty that is less sticky than GS and press those lines in with for example some thin stripes of plastic in the shape you want. You can layer these lines in differnt sized shapes and depth. And then once that is cured you press GS onto the mold to get the actuall positive result. Wait for the GS to cure somewhat then cut it into shape and wrap/glue it on the model. If you look very closely on the terminator honour on the chest for example you'll notice that the lines aren't perfectly sharp and the inner egdes are somewhat curved. That is a good sign of pressmolding.
Edit:
Totally forgot...
- The already mentioned GS - milliput mix is better for sharper details than pure GS as it isn't as rubbery.
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