I'm sure everyone has commented on the size of your image. but not sure if anyone has helped you avoid this. If you have had to make it this small to fint under the mb size limitation try this. Resize your image to 640x? usually 480, then when you go to save it (depending on your software) check your compression ratio, the more compression the smaller file size BUT the lower the quality also. In Adobe photoshop you can see the file size as you change compression levels so you know which to use. Some programs will have a save for web function or an optimizer. Those should help quite a bit. Good luck.
The picture is too small, as I am sure you have been already informed. I think it might look better if it was cropped to show more of the apple and a little of the grass & tree.
You did photograph an apple. This might be getting low scores because the photo is a little small. The title could use some help too. Photos that are clever or original tend to score higher than literal interpretations.
My screen resolution is 1280 pixels wide, your photo is only 261 pixels, a dot on the screen. You need to make your photo as large as is allowed, 640 pixels.