I don't think so. She looks to have a fair amount of bone and she doesn't look to be straining to carry your weight. How tall is she? She takes up your leg nicely (although she looks like she might be a bit on the tubby side?).
Do not tell me I can't...because I will show you that I can.
She's on the higher end of 14 hands. I'm 5'6 180. I had my stirrups a little higher than I like. I don't consider her "tubby" she's very stalky and muscular. I just feel like she's way to small for me when I ride her I feel bad =(
I think she's fine. A friend rode my 14.2 arab, she's 6'. She was hesitant at first but after a few minutes called my mare a, "Big little horse." My horse had no problem & she is not built like that mare you're riding.
A gentle hint: Lose the horizontal stripes, they don't flatter anyone over the age of 5.