I use PhotoShop Elements to prepare my images for posting. Generally, I resize to a 900x600 or 600x900 pixel size and save in low resolution. (Note that Blogger further reduces the size depending on the template.) I rename the images I want to save (so I can search by subject) with date (YYMMDD), subject, edits applied. The edits loosely correspond to the PhotoShop commands (-s900 for size; -crop; -con for contrast; etc.). If your browser supports "right click, properties" you will see the edits I have done. The above image was taken with the light from our living room window behind the candle holder. It has only been resized. Below are two steps which to me yield an improved image.
Cropped a little and adjusted shadows.
And finally, auto adjusted color and added a little contrast.