I can't pull the EXIF. What ISO were you set at? May be your issue on the waterfall. As for the landscape, it looks to me like you are shooting straight into the sun. The camera is probably metering heavy on the sun, leaving the rest underexposed. With light direct from the sky and also heavily reflecting off of the water, that's a tricky one to cover all of the ranges.
[TABLE="width: 100%"]
[TR="class: lookatme"]
[TH]Camera[/TH]
[TD]
Sony NEX-C3[/TD]
[/TR]
[TR="class: lookatme"]
[TH]Exposure[/TH]
[TD]0.017 sec (1/60)[/TD]
[/TR]
[TR="class: lookatme"]
[TH]Aperture[/TH]
[TD]f/4.0[/TD]
[/TR]
[TR="class: lookatme"]
[TH]Focal Length[/TH]
[TD]16 mm[/TD]
[/TR]
[TR]
[TH]ISO Speed[/TH]
[TD]1250[/TD]
[/TR]
[TR]
[TH]Exposure Bias[/TH]
[TD]0 EV[/TD]
[/TR]
[TR]
[TH]Flash[/TH]
[TD]Off, Did not fire[/TD]
[/TR]
[TR]
[TH]Image Description[/TH]
[TD]SONY DSC[/TD]
[/TR]
[TR]
[TH]X-Resolution[/TH]
[TD]240 dpi[/TD]
[/TR]
[TR]
[TH]Y-Resolution[/TH]
[TD]240 dpi[/TD]
[/TR]
[TR]
[TH]Software[/TH]
[TD]Adobe Photoshop Lightroom 3.5 (Windows)[/TD]
[/TR]
[TR]
[TH]Date and Time (Modified)[/TH]
[TD]2012:07:14 08:45:58[/TD]
[/TR]
[TR]
[TH]Exposure Program[/TH]
[TD]Program AE[/TD]
[/TR]
[TR]
[TH]Sensitivity Type[/TH]
[TD]Recommended Exposure Index[/TD]
[/TR]
[TR]
[TH]Recommended Exposure Index[/TH]
[TD]1250[/TD]
[/TR]
[TR]
[TH]Date and Time (Original)[/TH]
[TD]2012:07:08 07:02:36[/TD]
[/TR]
[TR]
[TH]Date and Time (Digitized)[/TH]
[TD]2012:07:08 07:02:36[/TD]
[/TR]
[TR]
[TH]Brightness Value[/TH]
[TD]1.87[/TD]
[/TR]
[TR]
[TH]Max Aperture Value[/TH]
[TD]2.8[/TD]
[/TR]
[TR]
[TH]Metering Mode[/TH]
[TD]Multi-segment[/TD]
[/TR]
[TR]
[TH]Light Source[/TH]
[TD]Unknown[/TD]
[/TR]
[TR]
[TH]Custom Rendered[/TH]
[TD]Normal[/TD]
[/TR]
[TR]
[TH]Exposure Mode[/TH]
[TD]Auto[/TD]
[/TR]
[TR]
[TH]White Balance[/TH]
[TD]Manual[/TD]
[/TR]
[TR]
[TH]Focal Length (35mm format)[/TH]
[TD]24 mm[/TD]
[/TR]
[TR]
[TH]Scene Capture Type[/TH]
[TD]Standard[/TD]
[/TR]
[TR]
[TH]Contrast[/TH]
[TD]Normal[/TD]
[/TR]
[TR]
[TH]Saturation[/TH]
[TD]Normal[/TD]
[/TR]
[TR]
[TH]Sharpness[/TH]
[TD]Normal[/TD]
[/TR]
[TR]
[TH]Lens Info[/TH]
[TD]16mm f/2.8[/TD]
[/TR]
[TR]
[TH]Lens Model[/TH]
[TD]E 16mm F2.8[/TD]
[/TR]
[TR]
[TH]Compression[/TH]
[TD]JPEG (old-style)[/TD]
[/TR]
[TR]
[TH]Coded Character Set[/TH]
[TD]UTF8[/TD]
[/TR]
[TR]
[TH]Date Created[/TH]
[TD]2012:07:08[/TD]
[/TR]
[TR]
[TH]Time Created[/TH]
[TD]07:02:36[/TD]
[/TR]
[TR]
[TH]Digital Creation Date[/TH]
[TD]2012:07:08[/TD]
[/TR]
[TR]
[TH]Digital Creation Time[/TH]
[TD]07:02:36[/TD]
[/TR]
[TR]
[TH]Caption- Abstract[/TH]
[TD]SONY DSC[/TD]
[/TR]
[TR]
[TH]Viewing Conditions Illuminant Type[/TH]
[TD]D50[/TD]
[/TR]
[TR]
[TH]Measurement Observer[/TH]
[TD]CIE 1931[/TD]
[/TR]
[TR]
[TH]Measurement Flare[/TH]
[TD]0.999%[/TD]
[/TR]
[TR]
[TH]Measurement Illuminant[/TH]
[TD]D65[/TD]
[/TR]
[TR]
[TH]XMPToolkit[/TH]
[TD]Adobe XMP Core 5.3-c007 1.136881, 2010/06/10-18:11:35[/TD]
[/TR]
[TR]
[TH]Creator Tool[/TH]
[TD]Adobe Photoshop Lightroom 3.5 (Windows)[/TD]
[/TR]
[TR]
[TH]Metadata Date[/TH]
[TD]2012:07:14 08:45:58-07:00[/TD]
[/TR]
[TR]
[TH]Lens[/TH]
[TD]E 16mm F2.8[/TD]
[/TR]
[TR]
[TH]Description[/TH]
[TD]SONY DSC[/TD]
[/TR]
[TR]
[TH]Color Transform[/TH]
[TD]YCbCr[/TD]
[/TR]
[/TABLE]