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would be good investing advice. I am young and have little money and my Roth is in the Vanguard Total International Stock Index, which has done well for me, but as I get more money I want to diversify more. Should I continue my focus on international stocks?

that is totally fine...
if you are older than 30 years old, a broad market total stock index fund is perfect...if you are younger than 30 years old, i would say the following:
60% MSCI EAFE Index
20% Emerging Markets Index
20% International Small Cap Index
If you want US Exposure too (i am presently 100% international and playing the declining dollar - will go back to the US once the dollar hits the bottom)
60% US Stocks
-20% S&P 500
-20% Russell 2000 Value
-10% Russell 2000 Growth
-10% Microcap Index
40% International
-25% EAFE Index
-10% Emerging Markets
-5% INternational Small Cap
just find cheap index funds and let it fly