breaking in lens

...with the obligatory duck shot..well got my 100-400 at christmas but the weather has been dreadful! so today was the first day out with it... need to practice a lot with this ...trying to get shots in very overcast weather is nigh on impossible for me at the mo , highish iso (800) slow speeds (160) aperture (5.6) damn the british weather ah well onwards and upwards as they say?
so here's one of my first pics with this lens c&c much welcomed

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Congrats on the lens, but you really have to practise handholding on slow shutterspeeds, as this one looks like it was blurry and then sharpened a lot.

100-400L IS is a great lens, so probably all bad photos are your fault.

Keep at it mate.