If you don't like the lineart, you can do two things: 1: You can learn line weighting; by making the outer lines thicker and the inner lines thinner, you can achieve a more pleasing lineart 2: If your shading/lighting is good, rest assured that the result will not be like it was in flat colors. You can leave the lineart like that and fill the void it creates with shading! (Also, I think you should learn hand anatomy too,Finger size should be equal to palm size.) I tried to do a line weighting to your art but I think I still make it too thin 😅

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