from some points of view plume looks pretty good
but if you want get better result try to find combination not in single planes but in combined for example " /\" "X"
also try to use few uvmapped version of plume it can be same color or a bit different
when you painting plumes you must know what exactly it is is it some kind of feathers is it horse hairs ...
when you using alpha channels leave background black or the same color as your plume is
in overall like for first try it looks good