I'm not positive I understand what you're saying. Is it that the
object is the wrong color? It's pretty easy to "color correct" in
photo shop and get your picture to true color. To help this, you can
place a true white in the corner of the picture, click on that for
your "correct to this color."
Or, if you're using film, it could be a lighting issue.
Macro lenses are great, you should have one. If that's too expensive
you can get these magnifying lenses that work pretty well. I used
them for a long time before both getting a macro lens and going
Metalsmith, Certified PMC Instructor
Hard to Find Tools for Metal Clay