Image blur Prob. on scale down in After effects

Hello Every One,
i was doing a project in After Effects for web at size 1200 *1000 Pixel,
but later client said to give output at 900 * 750,
when i scaled down the images present in Project,
they get blurred,
How can i solve it?

the images Present in project are illustrator *.ai files and PSD,
They are of size of 1200 * 1000 px (illustrator),
and 4000 *2500 + (psd)
The images has animations on it,
which i want to retain so,
cannot reuse scaled down image from Photoshop
other image

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