Here are some suggestions for photography buffs wanting to improve their work.
This is a great little book packed with useful information and how to skill building example to improve your still life and food photography. Everything from composition to post processing in Photoshop.
Adobe Lightroom gives you most of the post editing tools that photographers use most and allows you to edit images in a non-destructive manner by adding adjustment layers. You can create virtual copies of your RAW (recommended) or JPG images and try out different presets and adjustments.
Lightroom also is an image library to organize your photographs as well. Other features include web site and book layouts.
This program is is the foundation of any digital photographer’s work flow even if they take the image further with Photoshop or other image manipulating software.