Don't you get prints?
Maybe your pics are fine and the scanning to CD is spoiling them. Or maybe your original shots need better technique in some way.
Contact prints are a good way to assess the basic quality of your original negatives (focus, exposure.)
Have you tried asking your lab what is going wrong?
Photo CD is a bit of a loose term. Kodak used to have a format called Photo CD. I don't know if it is still in use or has been improved since the original release. Any photo can be scanned and stored digitally on a CD. There are numerous variations of scanning, correcting and storage formats that will change the qualities of the final file.
There are film scanners that take medium format film. Minolta and Nikon both make them. They cost about 2,000 UKP, so in the short run you may be better off taking your films to a more professional scanning bureau, who can drum scan it for you.
Finally, if you are thinking of submitting to magazines, find out what formats the art editors want.
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