To make some final adjustments you can use a simple image editor such as Preview on Mac or Paint on Windows. It allows you to crop a certain part of the image, or rotate the image. Also, you can adjust the brightness and color of the image. It could be wise to first duplicate of the image, and then make your adjustments. This way you can always come back to your previous versions. In Preview, select tools → adjust color to make changes, and make the image appear exactly the way you like it.