Heads are basically flat planes, like hero glow. Tails are like the Spell effects for the Archmage.
For those 8x8 textures, go to Rows and Columns, put the appropriate numbers in, and look for "HEADS" and "TAILS". If that 8x8 texture is a Head, look for:
Head (Life Span) and Head (Decay)
For 8x8 textures, put in these values:
00 33
32 64
01 01