I really liked the SP. I really dont know the effort of a person making a SP so i will try to be not so hard
The Characters Select Screen is the best thing I saw, if i will change anything would be the place where the big portrait will be. Something a little bit detailed. Then, the font that is used for the characters name for something more worked.
The Main and VS screens are too simple, try to make something with worked too.
Its good for a start and I hope you take my opinions to make this SP better. I will surely download it.