I have seen this large yellow butterfly ( only once at my home. It looked beautiful behind the leaves. Just by this picture I think it could be Cloudless sulphur butterfly (Phoebis sennae).
This tiny little butterfly, dart is seen during the warmer days in months of August to February. This oriental grass dart or common grass yellow (Eurema hecabe) has erratic flight and never rests for more than a few seconds. My attempts to capture it were mostly futile.