www.FreePhotoTool.com is a great free, browser-based program which is very similar to Photoshop. A duplicate version was created called www.FreePhotoEditor.net, created by Kamran Kahn. https://twitter.com/OnlineFreeToolsIncluded is a three part video tutorial for students to learn some techniques for photo retouching. These techniques can be used on any image, however, be sure you own the image or the rights to usage.The image featured in the videos is an Adobe Stock image which you can purchase