when you say "in tower", i guess you mean "i don't need something that repeats horizontally, i will have vertical-only scrolling, but i need something that gives the player the feeling that he's watching the inner of a round tower", right ?
hence your attempt at having bricks larger in the middle of your BG than on the border, which is a step in the good direction...
Now, what you still lack is curving of the horizontals. all will depend on the perspective for the rest of your scene, but a simple solution would be to bend horizontal as parallel arcs (as done in the castlevania example), despite 3D perspective would like to show straight line in the middle and increase curving as we depart from the horizon line (which will scroll very poorly
)
btw, it seems to me that you have just stretched the middle of an otherwise flat wall, right. That gives large, suspicious shadows on the middle bricks. You might prefer to edit this so that your bricks all have the same amount of shadow. You might also consider that light isn't uniform on your whole wall but rather