Hi Itoy,
I am sorry I haven't seen your message sooner. It's
been awhile since I have been here...
Anyway, I think you did a great job so far for someone
who has never touched watercolor!
( By the way, which WC paper are you using? And which
paints, brand etc?)
I have nothing much to say about the bridge and the
background trees: they work beautifully together, there
is a great contrast / action going on there. I would
maybe warm up a bit the wood on the bridge in the area
near us with maybe a hint of a warmer value. (Near us...
warmer; farther ... coolest). Check the colour of the
part of the bridge that goes from one side to the other
(just under the bridge), it is the same colour and resolution
from one side to another. It shouldn't because of perspective.
One way to correct that is by modifying a bit the color.
One technique to do that is by a glaze (like in oil):
prepare a mix of very light orange and a mix of very
light blue. Then glaze the part near us with orange
and about on the middle of the bridge without letting
the orange dry pick your blue and go on glazing till
the other side.
Be careful with the shrubs, plants that we can see
under and behind the bridge (near the water), they should'nt
be as detailed as the ones on the right because they
are away from the onlooker point of view. If you want
to increase the feeling of perspective, they have to
be less detailed, and maybe with cooler values.
Now about the reflection in the water... that's never
easy. I see that you are working dry on dry. Sometimes
reflections work better wet on wet, ie, firt you lay
a soft wash of your main water colour (no pun!), then
while it's still wet you drop hints of the objects reflected
in the water (with exactly the same colors /mixes that
you have used for these objects).
A suggestion, vary your greens, for instance, I see
that the green in the foreground and at the end of the
bridge is almost the same... Make it darker in the foreground,
drop hints of warm in the green near us and cooler in
the distance. Green always look better when they have
their complements (red) near them.
I think I have said it all... Please don't hesitate
to ask if you have doubts about that. 
I promise I am going to check this thread till you are
finished!
Anne-Claire Tavares
http://www.studio224.com/
