I wear a UK size 12...but I feel like I look bigger?! (Pictures)

Hello all. Just thought I'd update you.
So I finally fit into UK size 12 trousers (that'a a 8-10 in the US? but I'm not sure)
... Sometimes I find myself buying small dresses too!
This may sound all happy and dandy, but for some reason I feel like I look bigger. I'm sure you guys will agree with me in these pictures. Can anyone explain why I look in the mirror and see something bigger than the size I am wearing?

Do you like my wedgie?

(On a side note I noticed in my 'Stats' that someone is viewing my blog from the Palestinian territories. This is amazing. Please let me know if you are! mydietdiary@hotmail.co.uk)