Scaling a logo - not proportional

[leejones15]

Hi all,
I am an amateur Inkscape user and have just learned through YouTube videos and trial and error.  I've run into something I can't fix, though, and was hoping someone could help.
I have a logo for my robotics team that I am working on.  It isn't original work, I just took our school mascot and tweaked it to fit our needs.  The issue is, when I scale the model (make it bigger) it doesn't scale completely proportionally so the old logo ends up peaking through the cracks. 
Is there away to combine everything as-is? I'd rather not go back to square 1 and try again...
Thanks!
P.S. - the logo svg is attached.

GreenHawk Logo 11.svg
(2145.96 kB - downloaded 71 times)

[Moini]

Hold down Ctrl while scaling.

You may find the tutorials that come with Inkscape helpful for an introduction into the basics. (Help > Tutorials). More tutorials are available listed from https://forum.inkscapecommunity.com/index.php , then we have a beginners' guide that isn't listed anywhere yet, because it's not  finished yet: https://inkscape-manuals.readthedocs.io/en/latest/index.html . And for the very interested, there's also a list of in-depth tutorials about various topics here: http://www.inkscapeforum.com/viewtopic.php?f=6&t=11981 .

In the Help menu there's also a link to a keyboard shortcuts list that you may find helpful.