is the new image the same size?
The current image.. what filesystem?
is it configured with LVM (Logical Volume Management)?
what is the current disk usage... any directories obvious candidates for migrating?
it can be as simple as
- putting a filesystem on new image,
- adding fstab entry
- temporary mount
- moving data,
- mount --move TempMount RealMount
but really depends on circumstances
But , it might be easier to look at resizing the current image with VMware's tools