this image is a 256 color indexed BGRA rawdata with 16x8 tiles interleave.
the palette offset is 0x20, and the data offset is 0x420.
the width of the image is at 0x0C and the height is at 0x10.
palette offset is written at 0x14
data start offset is written on 0x18
hope this helps.
edit: forgot to mention that the data itself is employing a standard swizzle, using the graphic data as is will result in this: