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New camera, glass or technique?

Having started photography just over a year ago, i have come to a crossroad.
My main interest is wildlife (birds), ive had the nikon D40 and the 70-300mm VR lense all this time and think that i know how to use it pretty well.
Anyway, im pleased with some of my results but just feel they lack something, sharpness, colour that sort of thing.
Im thinking of maybe upgrading from this setup eg, D300 70-200mm F2.8.
Would this improve my images and get me the colour, sharpness etc. Perhaps its my technique and field craft letting me down.
Rather than spend money that perhaps isnt needed i thought i would seek your advice.
Thanks in advance
Danno
My main interest is wildlife (birds), ive had the nikon D40 and the 70-300mm VR lense all this time and think that i know how to use it pretty well.
Anyway, im pleased with some of my results but just feel they lack something, sharpness, colour that sort of thing.
Im thinking of maybe upgrading from this setup eg, D300 70-200mm F2.8.
Would this improve my images and get me the colour, sharpness etc. Perhaps its my technique and field craft letting me down.
Rather than spend money that perhaps isnt needed i thought i would seek your advice.
Thanks in advance
Danno

Just taken a quick look at your portfolio and there has been a distinct positive progression in the work.
Whilst the 70-200 is better glass, faster and will give better contrast it is also 100mm shorter, so you'd need to get closer to your subject. Some images look as though you are already cropping in, so that my not be the best move.
The D300 is a super camera, but glass is going to be a major factor in any upgrade.
Not really sure what to suggest, but if you go 70-200 you will need to factor in the 1.4 or 1.7x convertor as well to retain the same focal length approximately as now.
Some of the colour and contrast could be down to post-processing, but without knowing more about the software used, and whether you shoot RAW or jpeg then again it is hard to help too much.
Whilst the 70-200 is better glass, faster and will give better contrast it is also 100mm shorter, so you'd need to get closer to your subject. Some images look as though you are already cropping in, so that my not be the best move.
The D300 is a super camera, but glass is going to be a major factor in any upgrade.
Not really sure what to suggest, but if you go 70-200 you will need to factor in the 1.4 or 1.7x convertor as well to retain the same focal length approximately as now.
Some of the colour and contrast could be down to post-processing, but without knowing more about the software used, and whether you shoot RAW or jpeg then again it is hard to help too much.