well I am by no means an expert photographer but I'll help where I can.
knightkrawler wrote:I think what's wrong with my pictures is basically that the colors are represented wrong and blurry and too light overall.
A blurry image is most likely the result of camera movement while the shutter is open. Using your tripod should help with this. If you have, or can get a remote trigger for your camera use this as it will eliminate movement in the camera when you press the shutter release. If a remote trigger isn't an option use the time delay option on your shutter release. Press the button, step away and wait for the camera to do it's thing. Another cause of blur could be a wide aperture, meaning your camera physically cannot focus on all of your miniature because it's 'depth of focus' is too small. It could even be something as simple as a mucky lens.
I think if the 'colors are represented wrong' then its' probably the white balance that is set wrong. If you are lucky enough to be able to shoot in RAW you can actually adjust the white balance after taking the image but this requires the correct computer software. Your camera will probably have come with something suitable to do this if RAW is an option.
Check your camera instruction manual. If you can manually set the ISO, aperture and shutter speed learn how and read a few beginner tutorials on the internet on camera exposure (this is probably all I have done) and your photos will quickly improve.
Finally, if none of the above is an option try stepping away from the light box and artificial light. Set your miniatures up next to a window, with lots of natural light and see if your camera produces better images in these conditions. You can reflect natural light back onto your minis with a large sheet of white paper to fill in the shadows in a similar way to how the reflector is being used in this picture.
I hope some of this helps. As I said I am by no means an expert and not knowing the full capabilities of your camera it's difficult to offer advice.