Your photo is only 800 x 583 ~ of course it looks small ~
Others can magnify your photo by first downloading it and view at a bigger display or you can take the file with a bigger dimension such as 1600 x 1200 etc to make it bigger in appearance using the mouse roller ~
Also you can upload your photo to some photo album in a bigger size so that others can click on your link and see the original bigger file ~
Like this :
( your file is too small with less than 100k which is impossible to see details when magnifying it to a bigger size. You had beter take another one with higher resolution to try again ~ )