Because it's definitely some smoothing setting, and not simple 2x. Look on the video picture you posted - nose is much more even, and scar is less structured, for example.
I'll check it at home, if I will have free time.

Ah, wait, if you set up Daum, then you can change picture in realtime and observe results. Set in Video menu - Output (open GL or Direct3D), then start to experiment with Scalers. Skip Normal and Hardware, they are designed to give original picture. Your scaler is something about MAME, HQ, or other "advanced" filters.

P.S. All this scalers give some very different results, so if you cannot see the difference - double check output. Not every output supports every scaler (default Surface, for example, doesn't support anything, and Overlay - only limited range of them), so either GL, or Direct3D, if other is not work.

P.P.S. I toyed with scalers and shaders. Neither give the same look. :| They are too rough. Also, they are independent from each other, so it's really possible to have D3D+Hardware 3D - _and_ specific shader that will change the look.

Sorry, I have no idea how to help you more. Try to ask for dosbox.conf maybe? If there are nothing special, I'll had to believe it's really different version. :|

CRTD3D seems to be the best shader I've tried with hq2x scaler. It adds a lot of black level and reduces pixelation in FMVs the most. I think that is what I'm going to settle with. Thank you for all your help.

Well, you are welcome. :)