Your file size is only 53k when you could have used up to 150k. This indicates a lot of JPEG compression, which is one of the image quality issues going on here. Check the JPEG compression settings in your image editor and always try to save as close to the limit for a challenge as you can get it without going over.
Also looks like there is a lot of high ISO noise visible in all areas of the photo.
Although it looks posed I can't say I hate the picture, to me it looks like a snapshot from back in the day the aged sepia tone really makes this photograph work.