If you upload your photo to an image-sharing website (eg Photobucket), then you can post the image-link to it here, and the photo will be displayed here, regardless of how many KB it is.
If it is too wide for a nice display on the forum (and some people might not see it all because they don't scroll sideways), then you could reduce the width using the 'Resize' option in any graphics program. For a guide: JLMatterer's photo is 800 pixels wide; and Georgeag1972's photo is 1000 pixels wide.