Fitting an image in a SBox(Slate)

I need to resize an image and fit it in a small place. I am using SBox to achive it. But instead of resizing, the image size remains the same and only a small part of it is visible.

16056-untitled.jpg

This is what I am currently getting.

SNew(SBox)
.HAlign(HAlign_Left)
.VAlign(VAlign_Top)
.WidthOverride(16)
.HeightOverride(16)
[
	SNew(SImage)
	.Image(&GalaxyHUD->NuclearResourceImg)
]