Most of these are limited by my ability at the minute (especially given the 10 minute limit 
) So:
Iconised - No point trying for realistic just yet
3D - We’ll give this one a go
Transparency - Sure, why not (I’m not really getting what we’re meaning by in-game icons, but I’m sure it will make things look better
Shading - If I’m going with 3D I guess ‘realistic’ shading
Shape - Again I’m unsure what we’re meaning - If it’s Icons around the play-area (controls), then Ellipses look nice (vertically larger), if we’re talking about game icons then square (although with transparency does it matter?)
Axis of Symmetry - As tempting as doing half the work and mirroring it sounds, we’ll go with ‘no’ for this one
Well, let’s see what happens shall we
EDIT after Lesson 22:
ok, so bit more aware of what I want now:
Iconised: No - semi-realistic gives more chance to practice the stuff in the lessons.
3D - No - There will be drop-shadows but that’s as far as it goes
Transparency - Yes. The icons i’ve done so far will need tweaking, but transparency is the way of the future
Shading - Yes, see above
Shape - We’ll be going for a square border, black on the outside pixels to give nice separation. The icons will be drawn diagonally Bottom-Left to Top-Right
Symmetry - No