3d camera composite layer video doesnt come in the same size

I started this project in premiere pro. one layer is the effiel tower another is an artist already green screened and sized. i exported each layer seperately both in 1920 x1080. brought them into a after effects first the tower to use the 3d camera on to place the artist in a stationary spot afterwards.  do the steps, pick a position, create a solid and camera, precompose the solid, size the composition to match the 1920 x 1080, bring in the video of the artist, delete the solid. once it artist is now in the overall comp, its way bigger then it should be and if i scale it it becomes blurry