Well since this is your first fake I can only give you a few general tips otherwise we'll be here all day:

1 - dont copy and paste. Try editing sprites and backgrounds to make them unique
2. it doesnt make sense that Kung Lao and Sektor are killing Rain and his name isnt even on the lifebars
3. Make the blood beneath the sprites so it doesnt look like it's pooling on top of their feet

All in all, just try being more unique. I can't really see any problems with the minor details.

Thank for the tips. I'll try another one. I just don't know how to edit sprites very well.

Okay, sorry for the double post. I'm having trouble uploading a new fake. It says it has to be "JPG, PNG, and something else." The file I'm trying to upload has .png at the end. Could anyone help me?

Make sure ".png" is NOT in capital letters, otherwise the upload tool will give you some trouble. If it's not that, well... try a different file format? Btw, the fake is all right, but yeah, make it more interesting/original.