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I think you need to work on your lighting a little bit Sonti. A lot of your sigs here either have too much lighting(3,5,6,7) or none at all really(1,2). You'll need to try and find a happy medium between the two, and not use a white soft brush to create lighting unless you're setting the layer to overlay/soft light.

I think 2 and 3 are my favourite here.

U ahve any Tipps for my lightning ? Till yet i always used Softbrushes Black/White, but looks very unreal.

Soft brushing can work, you just need to change the colour of it to fit with your colour scheme. Then after you've done a little light brushing with it, try changing the layer mode around and seeing what the outcome is. I find colour dodge and linear dodge work well for this.

MOstly it looks like this then :

http://k.min.us/jkTY7G.png

Ok, that is too much lighting...you need to see what is in the sig first off, and base the lighting off that. Dodge and Burn work well, in tandem with the soft brush. I also use lens flare every now and then

You just need to work at it, because it does work for most sigs. Normally, what I do is turn the layer to colour dodge before I've done anything and turn the brush opacity down to 30%. Then I begin. That way I can get a lot more control over what the outcome is.

What Yurtles said as well. Dodge/burn should be used in most sigs, even if it's only a little bit.