pen tool not to perfect work ?

Can you clarify your issue. The pen tool draws paths not lines. Paths are only visible when selected in the paths panel - they are not part of the image.

A path can of course have a stroke which does become part of the visible image. We really need to see a full screen screenshot of your issue, along with a bit more explanation, in order to give advice.

The width and colour of the path can be adjusted in Preferences and in options.

Dave

Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Paths, Options Bar, …) visible? 

Please try first to reset the preferences of Photoshop using the steps described here:

https://helpx.adobe.com/photoshop/using/preferences.html#reset-preferences

Please backup your settings before resetting the preferences. You can check:

https://helpx.adobe.com/photoshop/using/preferences.html#backup-photoshop-preferences

Another try it to turning on the option »Deactivate Native Canvas« (Photoshop > Preferences > Technology Previews) and restarting Photoshop.

If this doesn't help we need more informations about your system including the following:

• Adobe product and version number
• Operating system and version number
• The full text of any error message (s)
• What you were doing when the problem occurred
• Screenshots of the problem
• Computer hardware, such as CPU; GPU; the amount of RAM; etc

What has been changed on your system before the error occur?

Thanks. The above info will help to solve your problem.