The final shot is perfect, wonderful work!
The first shot is improved but I noticed there’s a bit of wobble between planet and ship, perhaps the extending of the shot made it more obvious. Not a big deal either way. There’s also a bit of a ‘cutout’ look to the ship overlaying the planet here, maybe putting some light bleed from the planet around the edges of the ship would blend the elements more, especially since the sunlight glare on the planet now overlaps part of the ship. Some effect like this, though maybe not quite so dramatic: