How do I build this body line

Thanks dicer, on the larger areas i was doing as you recommened with red and blue hardener for the reason you stated. Im just stuck on the lines. I guess its attack them slowly with patience. I have different size dowels and many sanding blocks big and small. I remember seeing a video or something once that showed using masking tape as well to help make and preserve the line but couldnt find that again. I'll attack it more tonight and hopefully more will chime in here as well.
Thanks Rod