If you do a lot of work and plan on doing this work as a business you may want to consider the Lightroom/Photoshop deal for $10/month.
Both of these products have a wealth of features, some of which are complex and take a lot of learning. BUT! They also have easy to use tools and there is a huge amount of free information on the web. Once you have them you have all you will ever need for post-processing. Later you can add apps to PS that will do special touches like skin .
Two important points. One is, you pay by the month and if it turns out it's not for you then you just stop.
Also, it's tax deductible so if you make 10 bucks a month you've paid for it......