okay,
good:
you tried to blend the render in which is a good start, alot of begginers dont do this so your on the right track in that aspect.
bad:
the render should be the main focal point in the sig, here it's not, my eyes are more draw to the c4d, mess around with opacity and blending, make it so that the c4d compliments the render, not takes away from its effect.
follow some tutorials, and you will get better