I concur with Mike on this one. The first thing I look for is that colour differential, which is due to the huge distance between the two main objects. NGC 3603 should be a deeper red as it is in your image due to being further away and more affected by interstellar matter than the NGC 3576 complex. There is plenty of that 'interstellar matter,' in the form of the dark nebula top left as well. Very nice in deed.
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