this dude is right. ill add onto this and say that letter proportioning is a big part of what makes something look tight. By that i mean that lines, thickness, and all that shit have to relate perfectly and shit. Also cleanliness goes a long way. if you look at a raels piece, like this dude said, it is so fuckin clean and proportioned perfectly. Another tip, and adding on to what these other dudes said, start with tags, then do strait letters. I started piecing with more complicated letters and it fucked me up in the long run because i had proportioning problems that i didnt even realize. I was treating letters like any other drawing, and over all they arnt. well i hope this little rant helped. if it doesnt make any sense, or if you already knew all this then i suppose you read this for nothing and im sorry, but i have been up for atleast 36 hours and im about to passout.