The 4 spots on the hindwing are in Cardui of almost the same size, in yours not, #1 and #4 are a little bit larger. If you look at the forewing (about in the middle towards the outer margin) you seean orange patch with a tiny white spot in it. This spot you never will see in Cardui.
Cardui for comparison
http://www.flickr.com/photos/dominikhofer/4117239541/
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