I like how depressed Felost looks. It looks so broken it almost looks crazy. I would have chosen that crazy purple creature as my pokemon anyday. I really like it.
You did a fantastic job with your starter sprites by the way, they are really detailed and pretty with different value . I would choose Nilash as my starter and that is a complement, I don't usually go for the water starter but I really like your water pokemon's design. Also, it has really cute and bubbly red eyes :0 It would probably balance Felost's depression with it's bubblyness.