You need to move in closer to fill the frame with the subject. That would eliminate the windo, you just have to watch that the light from the windo does not mess with the exposure. Try filling the frame with a single rose shot in close and tight.
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Canon 50D, 70-200 f4L IS, 20-35 f2.8L, 100 F2.8L IS, 300mm F4L IS, 430ex, and assorted gadgets. 
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