hello bud, not bad, but can i suggest some things,

tamiya paints arent the best to work with when painting figures,
(or horses lol) if you can, get your hands on some vallejo paints,
they are brillaiant and really easy to work with,
the pre shading didnt go to badly, its a good idea, if you shaded the natural shadow points,
(in creases, underneath protruding items) you would get a much nicer effect.
your saddle has a little FeldGrau overlapping onto the white, but thats no difficult fix, and if you spend a few more minutes defining the front harnessy thingy i think your in for a winner,
please dont take these comments badly, i am just giving friendy advice
:)
ps for the hooves i would go with a satin(?) brownish colour,
if you doo a google image search for horses you will get what i mean
ps again, it may be tedious work ( i know it for sure it bores me) but if you build up thin layers of paint as well you produce a better finish
what figures have you got to come with Mr. Horsie here then
all the best
James
(i hope i have helped and you find my critisisms constructive)