The pipes on an 'L' are shorter and more flared.

Like the pic above, I think you can do a lot with custom seat work and new handlebars. I also think the pinstripe on the L tank exemplifies the teardrop shape. If you get rid of that stripe, or break it like the pic above, it will help.

Depending on how much of a project you want, you could modify and/or paint the fenders, change the tail light, and maybe swap a few things up front.