Great post! Although I already know these things you've mentioned here, I am always curious. So, I always check new posts like this about blog formatting and styling, to see if there's something in it that I don't know about yet.
I'd also like to add that if one does not have access to Photoshop, he or she can use GIMP. It is a free open-source photo editing app similar to Photoshop, and easy to learn, especially if they already know how to use Photoshop, and other image editing software.
Another great free and open-source app is Krita. It is an illustration and digital painting software that's similar to Corel Painter, and is just as powerful.
You can download GIMP at https://www.gimp.org/
and Krita at https://krita.org/en/