Attached Link: BB's Light Meter

The best way to judge an image is from it's histogram, something that the vast majority of image editors will have (Poser doesn't, unfortunately, but then it's not an image editor). It will display the RGB values for each pixel in the image graphically, and is completely independant of hardware or subjective opinion. Each pixel has a value between 0,0,0 = black to 255,255,255 = white. The histogram for the image you've posted shows that all the data is way down compressed into the far left so the image is too dark and without contrast. Ideally you should have data spread across the range without slamming into the far right or left (called clipping and results in detail being lost) - exactly how it's distributed depends on the image though.

The best tool I know of for judging lighting intensity in Poser is Bagginsbill's free Light Meter (see link). This will tell you if your lights are too weak or too strong very easily. Depending on which version of Poser you're using there are also useful tools like gamma correction and HSV tone mapping which can help.

Images displaying consistently across different setups is an issue. The other valuable thing that can be done by a lot of image editors is to save an image with a colour profile, the most useful one for web posting being an sRGB profile as that is common to just about all display devices. In effect it tells the device how the values in the image should display, so if you have a good range of values without clipping on the histogram, plus an sRGB profile, you've done as much as possible (without buying a hardware calibration device anyway) to ensure that what you see on your screen is going to be consistent on other screens too.

So yes, check your calibration, but I'd suggest trying that Light Meter too 

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