I actually don't think it looks like Giratina that much, really. Maybe you should bodify the head a bit so that it looks even more different from Giratina's Origin Forme... But the first Pokémon to pop in my mind when I saw this was Rayquaza. Maybe you should also make it longer and add something to the tail? Just some suggestions to make it differ from Giratina more, if you're concerned about their likeness.
I also agree that the picture is really low quality and the drawing is a bit rushed, but I like it nevertheless. The pose is very good and I also like the general design of your Fakemon. Maybe you should try to modify it a bit, draw another version, maybe also shade it so it doesn't look as rushed, and try to get a better picture. I know it's hard to get a good picture with a camera, but I'm almost positive you can one with better quality than this. Try a better lighting and maybe take the picture from a bit further... Also, drawing on blank paper makes the result seem less rushed.
Just some tips to make it better ^-^ I honestly think it's a very promising design, but it needs some work. So, keep at it!
