I think they look great! I love the idea of adding curly tails, and maybe just the snout nostrils, eyes, and mouth...I have been collecting all things piggy for about 15 years! It actually started when a friend and her husband brought me a pig with wings back from their vacation...in response to me always saying "when pigs fly..."...it just snowballed from there...I bet I have close to 300 pig themed items!! I just think your outlines are precious, and wouldn't add a whole lot of detail, as you don't need it!!
Regards,
Kif