Looking really good! I am sure you can put a clear coat on the tank (would need to be fuel safe though) or perhaps sanding it with a very high grit water sandpaper until it is smooth and then you can buff it to a shiny look.
Here you go ... first hit on google .... https://www.youtube.com/watch?v=nYbWf8dqzms
1983 Honda ATC250R
1983 Honda ATC200E BIG RED (sold)
1984 Honda ATC200E BIG RED
1984 Honda ATC200X (sold)
1985 Honda ATC70 x 3
1985 Honda ATC250ES BIG RED
1986 Honda ATC250ES BIG RED
1988 Honda ATC250ES BIG RED
1995 Honda Frankentrike 50cc 2-stroke
2001 Honda TRX90
2004 Honda TRX300EX (sold)
2008 Honda TRX250TM
1976 Suzuki RV90M (sold)
1967 Vespa Primavera 125
1958 Massey Ferguson 35