#3 is it possible to disable profile picture in Comment burble?.. I will like to do this if the issue is not fixed.

You can use the CSS code below: 

#wpd-bubble-wrapper #wpd-bubble-notification-message #wpd-bubble-author-avatar {
    display: none;
}

It's too hard to debug this issue on your website as far as the comments are being held for moderation. 

#2 How can I decrease the Burble Size?

Use the CSS code below:

#wpd-bubble-wrapper>div {
    width: ***50px;***
    height: ***50px;***
}
#wpd-bubble-wrapper svg {
   width: ***100%;***
   height: ***60%;***
}

The red marked values should be changed as you like. 

And how can I Disable the The white Shadow around the Comment burble?

The solution is provided below: 

#wpd-bubble-wrapper>div{
    box-shadow: none;
}

All CSS codes should be put in the Top Admin Bar > Customize > Additional CSS > "Additional CSS" textarea, save it, delete all caches and check again.

#4 I will like to have A style like this in Comment Burble.. Comment Icon to have yellow color and Background to have White.. How to do it?

Please check out this doc: https://wpdiscuz.com/docs/wpdiscuz-7/plugin-settings/styles-and-colors/#colors

If you don't find some settings for changing the color, you should use the additional CSS codes. 

Set "0" as a value of the option "Bubble - Invite to comment in X seconds". More info here: https://wpdiscuz.com/docs/wpdiscuz-7/plugin-settings/live-commenting-and-notifications/#bubble-%E2%80%93-invite-to-comment-in-x-seconds 

Also How to disable Message to invite users to comment? I don't want to invite them

Your website doesn't work for us. I see a withe screen with some links. Also, I see Threat Report from by Antivirus software when I call your website URL. Here is the report:

#2 How can I decrease the Burble Size? And how can I Disable the The white Shadow around the Comment burble?

#3 is it possible to disable profile picture in Comment burble?.. I will like to do this if the issue is not fixed.

Thanks

#4 I will like to have A style like this in Comment Burble.. Comment Icon to have yellow color and Background to have White.. How to do it?