To describe someone as looking very disheveled or embarrassed after falpng, you could say that they look "flustered" or "rumpled." You could also say that they look "bedraggled" or "disheveled." For example, you could say "She tripped and fell on the sidewalk, and she looked flustered as she tried to pick herself up." or "He took a hard spill off his bike, and now he's all rumpled and disheveled."