The first image looks like it needs some fill flash from the front. Then you can make adjustments afterwards to get the look you are after. Use the onboard flash stopped down by 1 stop and try to diffuse the flash with tissue. You may have to play with the flash until you get it right. I am right in gathering that the main light source is from the back or over the top.
The second image is harder because you want to keep the dark shadows but lighten them just slightly so that detail becomes apparent. I would stop down the flash as much as I could and see what that does.
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