Hi Kendel, ad welcome to the forums!
If your computer runs on Microsoft Office software, as most of us poor unfortunates in the world use, then it will include Microsoft Office Picture Manager. Round about the middle of the taskbar at the top, if you open your picture files with this program, you will find the heading 'Picture'. This allows you to adjust the pic in a great many ways and it is worth exploring the various possibilities - lighter, darker, contrast, saturation - and size!
If you do not have any form of picture managing software, then there are free programs you can download or you can buy a picture management package. If you right click on the photo it will give you the option 'Open with' and if you move your cursor over 'Open with' it will give you a list of the possible programs. That is where you will find MO Picture Manager, or any other program you have installed. Not all programs (e.g. 'Paint' and 'Windows Picture and Fax Viewer') give you these options.