I applaud the OP for posting this up as it does take time and it is for the benefit for everyone. Your engine is very clean and you spent some time on the project.
There are two schools of thought on this process. The Lexus method mentioned above and the one used by myself and perhaps others.
The Lexus manual does call for lining up with the T marks to remove the belt which is 50 degrees ATDC. This is to prevent the left camshaft (right if your looking at the motor from the front) from spinning counterclockwise and hitting valves (serious doubt that you would bend one anyhow at this point) .
Then the manual states to move each gear over to TDC which is I for the camshafts and the notched on the crank pulley/oil pump before installing the belt which makes little sense as the camshaft can still and most likely will move anyhow when back to TDC so why bother lining it up to T to begin with.
So in order, from the Lexus manual
1) Line up everything to TDC as pictured above in the small pics to ensure everything is lined up. This is I on the camshafts and 0 on the crank pulley (not gear).
2) Move the crank 50 degrees ATDC to match the notches on the cam to T and the crank notch to the little dot on the plastic timing cover.
3) Remove the crank bolt and timing cover and remove the tensioner ,belt,etc..
4) Move the gears over to TDC again to install the timing belt.
Again, the above is from the Lexus manual itself for a SC430-same motor.
Myself , I just lined everything up with I and the crank to 0 on the cover and notch to notch on the oil pump. It could be done either way I suppose.
See close up pictures here of the timing marks in the SC430 section from my timing belt replacement.