resizing help

i've asked this before awhile back at iconmakerlove and i thought my problem was over with but now it's back again.

okay so for some reason when i resize a picture to icon size it gets choppy. i only have this problem when i'm doing icons and want to include the persons whole body, i don't have this problem when i do close ups of their faces. i have smart size selected for resizing and i've used that for a long long time and haven't had much trouble with it. so my question is do ya'll have any suggestions or tips on how to fix the choppiness when i resize a picture? i'm just getting really annoyed with this so any help would be great

p.s. i use psp 8