If it was an older road bike, I would say to paint the welds, brackets and joints. then to pin stripe the edges with a opposite color and make the frame bright.

In your position, because you're going to sell it, find the entire set of a color for the bike. Grips, cables, pedals, seat and whatnot and paint the same color. Something bright would pop out to a buyer and a nice coat of clear wouldn't hurt.

Remember, sand and wipe with alcohol before you paint, time in painting means great paint