When I read the title I thought "mid-back is my favorite", and it appears you think of growing to mid-back too. I like your length, but I prefer longer, but for the girl it's worse to manage so much hair, so you gotta think about this too, but it doesn't hurt you to try.
I like it, but it'll be a real bitch to mange it. Oh and if you like to straighten your hair, you might as well forget about it because, it'll never get anywhere close to being perfectly straight. So if you like your natural hair, then go for it, if not keep as it is.
Do what You think you look good in. All a matter of preference, yours looks good though to me. Which is saying a lot because I prefer shorter hair, like, mine or a bit above shoulder length. Think, Jennifer Lawrence I guess lol.