Looking at the metadata of your second posting (the flat one), I see that it was indeed shot in Raw and opened in PSCS6/ACR7 (_MG_1031.CR2). This being the case, there is no camera setting that will make the initial image contrastier because camera settings do not affect Raw files. Also the contrast, or lack of it, is not caused by ISO, or metered exposure or exposure compensation. It is caused by three factors; the primary one being the flat illumination, second the limited tonal range of the subject, and third the fact that Adobe Camera Raw's default rendering of Raw files is intentionally bland and flat - flatter than any other Raw converter because Adobe believes that a Raw conversion should also be the product of user input and the default render is merely the starting point.
In this case, however, that flatness is furthered by the fact that although ACR 7.0 was the first version of ACR to utilize the new Process Version 2012, you seem to have it set to use the older Process Version 2010, which by it's nature tended to produce flatter defaults.
I would advise to utilize the full editing power of the Raw file that you are already shooting by switching to P.V. 2012 and doing most, if not all, your adjustments in ACR, rather than afterwards with PSCS6's Levels tool.
Oh, one more thing - when you output jpg images for web posting, if they are in Adobe RGB space (as are these two above), anybody who is not viewing them in a properly implemented color-managed browser environment will see them as flatter and darker than you intend. Convert them to sRGB.