Hi Eetu!
Nice picture. I didnt get to see picture one and two, and how picture three came to be, so I am a little at a loss. In addition, the size of the picture you posted wont allow me to see much in terms of the jaggedness that you mentioned.
I am not sure how experienced you are with your camera and PP, and in fact, since you own a better camera than mine, I hope I wont step any toes when my advice is to actually take more picture.
I do a lot of PP myself, and I like to think anything can be fixed PP. However, when the subject theme is readily available (like flowers), I think it is just better practice for you to redo the shot, and get it right the first time in shot. PP is fine, but it should not be a crutch