*Looking at the 3rd group of images from top,the dashed line,from cowl to nose,in between fender blisters is basically straight.This can cause the air to overshoot the corner leading over the top,creating separation right there.If there was camber behind there,a favorable pressure gradient would help hold the boundary layer in place,but we don't have that. Some radius at the top would fix it,allowing the two tributary streamline filaments to merge as one.
*Secondly,in Hoerner's section on canopies and blisters he discusses interference drag where the bump integrates to its attaching wall (your car body).According to his presented data,the canopy will have a drag minimum when its height is about 11.5% of canopy length.
*Also,to minimize interference drag where the canopy and body actually join,a fillet which is 4-8% of canopy length (chord ) is best.If you overdo it,it will create supervelocity,leading to higher local flow speed,which will create shear between adjoining streamlines and likelihood of turbulence.
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I like the leading edge plan view radii and plan taper at rear.Her heartbeat is strengthening!
