I think it's pretty! I really like that the colour palette is restricted. My one issue wouldn't be the flowers themselves, but the height of the arrangement maybe stopping guests from seeing and chatting to each other across the table? That said, the tables at my sister's wedding were so big that you could really only talk to the people on either side of you due to the noise inside the venue and the width of the table, so maybe it doesn't matter.
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I agree with this. Height of centerpieces gets overlooked a lot. Of you are ok with not being able to talk to guests across the table I say go for it! I bet these could be "lowered" to accommodate cross table conversation.