cool tattoo. no need to cover it up... it'll fit right in with a traditional sleeve no matter which way it's facing. don't overthink it!
i'd say the "rules" are that tattoos should face forward if they're on the side and face inward if they're on the front or back. i did a quick search of Bert Krak's IG for some examples. The peacocks on the back of the calves both face inwards. But on the client with the eagle backpiece, you can see a skull facing in and a hannya facing out... and no one will say that one's right or wrong. it's not even consistent and it doesn't matter! 😃 Just keep getting tattooed and it'll be all good!