Your question is not clear but trying to answer part of your query:
Every Image will occupy some space in GB (Giga bytes) or MB (Mega bytes) depending upon the way it was built using the dockerfile (Image size depends on the docker instructions and what is the parent/baseOS images being used).
Once you push the image to ACR, it will consume the same amount of space.
What goes into the Image:
For example if your dockerfile has got below instructions:
FROM ubuntu:16.04
RUN apt-get update && apt-get install -y python2 python-pip
RUN pip install flask
Once the Image is built it will have a Ubuntu OS with Python Installed along with PIP package followed by flask webserver. If you push the same image to ACR it will have the same packages installed with some amount of space occupied.
Regards,
Shiva