http://i1233.photobucket.com/albums/.../Bubbleboy.png
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Funny.
Well i like the color in the first tags. Some few tweeks which is needed in first tag to make it look better. First of all the blending of render. You see the render is not looking well blended. Do one thing take a new layer take a soft brush and take color from the tag which is matching the bg and brush the sides of the render and set it to hard light, color or screen whichever looks good. Than do some adjustments like gmaps, filters and color balance to blend the render more in a good way. This will also make the color look more good. Now to make tag more good you can add more effects. I see you used bubble c4d which is good but erase the bubble from the render mouth. And add some effects on lighten, screen or linear dodge. Now lighting well see don't give lighting to whole render. Just give light where the light is coming from. When you fill up the negative space see where light is coming from and than do lighting and for blending i gave you how to do in first tag tip.
KIU. If you have any problem in understanding this feel free to ask me.:)
