When in middle school I used to wear large t-shirts and pants/shorts and so forth and have medium length hair parted to the left. I didn't care about my clothes and I was generally unstylish.
Now I have short, unparted hair and I don't buy t-shirts over size small if I can help it. And I have some tight jeans too... And generally my clothes are more fashionable.
That's pretty much the extent of my change in appearance. Well, I might note that before I switched to the current hairstyle I had actually grown my hair out to a longish length.
Since it's more interesting this way, I attached a couple pics to show the difference - which isn't all that extreme, but still.
Now:
Not that I dress like that every day...
Then: see attachments - I'm not exactly proud of that pic with the long hair. Oy.
I'd rather see some pics to compare people who made more interesting changes.