Face Fillet Advice

Hello! I am currently working on the junction between the fuselage and wing root of an airplane. I have tried to add a face fillet between the two but it is small and hard to see from a distance. You need to zoom in and change the display style to shaded to see it. Anytime I try to increase the fillet above 1mm it fails. Does anyone have advice on how to make the fillet more pronounced or know of another method to blend the wing and the fuselage? I want it to be smooth like the junction on the white airplane in the picture attached. Thanks!

SolidworksModeling And Assemblies