Sorry, I don't speak cow.

moo

 I think he is right with the contrast of the sun because the sun is not the center of the piece, that's the arch and then the sun is a secondary highlight

no.                        

yes.

Nice and simple, but you need to up the contrast on either the sky or the sun.

 the reflection is very nicely done, but the yellow sun does not look bright enough in contrast with the sky.