Translating this sentence (preposition?)

So the sentence in English that I want to say is "Why does it look so different from the picture?"

Sorry ... I don't know how to write in jyutping but I'll just try my best to transliterate ...

Deem-guy tung seung ___ gum m-tung ge?

I feel like I'm missing some preposition or filler word where the blank is. I'm not sure though ... it just sounds funny. I tend to always have this problem when speaking Cantonese. I know all the words I need but when I put it into sentences, I feel like I'm missing words here and there and it doesn't sound harmonious/fluent.

Please check if I translated it correctly or if I'm missing something.

Thanks! :)