hi there! you're so pretty! i don't think you look dumpy by any means, but i compared the two outfits and a couple of things jump out at me.
- the first is the top. angie recommends a casual top that is not a tshirt. your top looks to me to be a tshirt. i think you could get away with a casual top or a cool graphic tee that is perhaps a wee bit more fitted. does that make sense?
- the second is the blazer seems a tad big for you - the sleeves fall rather long, which makes it look slightly overwhelming... maybe that's where you get the "dumpy" vibe? i would try rolling up and scrunching the sleeves up to your elbows, which gives it a kind of cool, casual vibe.
- colors - the pale green and light tan of the jacket are really pretty, but worn together they wash you out a little. perhaps choose a brighter top, in a richer, more saturated color? a fuschia or a teal perhaps? i think those would really bring out your wonderful skin tone!
- accessories - a lightweight spring scarf (of the kind angie posted) and a couple of bangles may do the trick in bringing it up a notch and making you feel fab!
i hope that helps!