lighting bug and quality problem (please help)

Support Lighting and Rendering
1

hey guys
I’m trying to learn blender by myself (it’s too hard for me to learn from trainings …)
so , I’m using cycle render with nodes . after rendering a model of xnalara , it shows some shadow (or lighting) bugs & I don’t know how to fix it !
1- this is texture in 3d view mode :


and this is same place after render :


what can I do for fix that problem ?

2- and another thing is quality problem !
this is my model texture in xnalara :

qxna.PNG1167×558 694 KB


and after render in blender :
http://i.imgur.com/MWJsYZ9.png

what can I do ?
please help :frowning:

2

could you give us the scene?

3

Do the basic problem solving tasks

Check for duplicate faces / vertices
Check normals of all faces and recalculate or flip those which are inverted
If you have modifiers turn on/off to see if they are causing issues
Actually look at the mesh where you see these issues ? Move a vertex etc, do you see any problem etc etc

For support questions you should ALWAYS supply a demo blend file for review at the very minimum.