The pictures in profiles are controlled by that number in config.
Increase the number a bit. You can change it to suit your tastes.
Keep in mind that any picture shown in a profile is also shown on your post pages under the user's title. Now if you want to keep the number at 80 x 80 which is right for a picture in a post but increase the picture in the profile to a bigger size do this
In showprofile.tmpl in your template directory find this line:
<td align="right" valign="top" rowspan="12">
<img src="$Picture" alt="Picture" width="$width" height="$height" />
</td>
For starters try something like this.
<td align="right" valign="top" rowspan="12">
<img src="$Picture" alt="Picture" width="200" height="200" />
</td>
You can adjust the sizes to whatever you want.
You can see a preview here at my test site. I did this up to show you. The post pictures are still 80 x 80 but the picture is bigger in the profile.
http://www.reeftalk.com/beta/showpr...ew=&sb=5&o=&fpart=1&vc=1