I think the two tone looks pretty good like you have it drawn, but have a couple of thoughts. First, it will look a lot different when you have a seat, both because the contours of the seat will have an overall effect on the look of the bike, and because if black, will have an impact on the design of the paint if you indeed use black - especially if black seat and black paint meet as they will with your design - your visual edge will be impacted. The other thing is that with the fairly horizontal boundary you have, and being black on the bottom, the unique shape of the bottom lines of your bodywork are visually neutralized - your eye being more impressed with the much stronger horizontal line and sharp color contrast of the two tone. I might consider making an effort to capitalize on the shape of the bodywork, but the unusual shape may take some doing. Lastly, two tone paint schemes tend to look good with sort of a 2/3 rds to 1/3 rd area ratio which is one reason why your current scheme looks good. Be careful adding another stripe down the center as it will have a big impact on balance. You don't see it looking just from the side or top, but in real life you never see your bike that way.