Heck yeah a 38, 39 or 40mm watch will look good on your wrist! You might not be used to it now but trust me they are extremely valid sizes - arguably even better looking and more confortable as well. I have a 6,75inch wrist and I usually wear a 34mm watch and I don’t think it’s too small. Just try them on and you will be positively surprised 👍 (Btw I’m 22. So I’m not somebody who gre up with wearing 34mm watches. Myfirst watch was a 42mm chronograph lol. But that 34 really does it for me! I honestly just think that my 42 looks tacky and too big).