It might sound wierd, but using Adobe Photoshop with film photography can improve your images.
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Timestamps
00:00 Intro
00:43 Remove dust and scratches
03:25 Remove any color cast (first method)
05:15 Remove color cast (second method)
06:09 Brightness and contrast adjustments
09:26 Local adjustments (masking)
12:58 No scanner ? No problem ! DSLR ftw !
15:11 Save the picture with the good color profile
15:45 Is this cheating ? No !
16:42 Outro