I agree the 2013 looks strange, colour is okay but it looks a bit lost, also the position of the hawkshead makes 2013 look off centre.
Finally, why italic? Inconsistent with font elsewhere.
I would move 2013 top edge or bottom edge of frame, keep it yellow (nice contrasting) but slightly larger, loose the italic.
Weekend days: red and green should never be seen, would yellow work here? Pastel green? Mustard at a push?
Great image of the hawk, tricky exposure, maybe lift fill a little in raw if you have the chance (a bit easier than going back to the same spot in the summer and hoping the same beautiful creature makes the same fantastic eye contact, but oh yeah, adding a third of a stop more fill flash, silly!) if not a slight mids lift in levels on the jpeg.
For me the dappled highlight is rightly just on the cusp of burning out, the body of the bird has detail and contrast, there is a catchlight - I really think others are splitting hairs, or feathers, I would be exceptionally chuffed if I'd captured this!
So for me it's just the 2013 position and size and the red weekends. Even if I like to paint the town red at weekends.