hi,
I made another version following your instructions, now I understand the use of icons and understand why you wanted "fatter" lines.
I hope you like this version, here there are only
6 examples, but if they are right I will continue in this way!
Design the sleekest car feature icons
- Contest holder: joopgeelen
- Category: Buttons, icons
- Status: Ended
- Files: File 1
Start date: 21-07-2016
Ending date: 28-07-2016
It all started with an idea...
A short, interactive guide helped them discover their design style and clearly captured what they needed.
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Clients looking for a new logo or brand identity describe what they need. Designers can then participate in the project via Brandsupply by submitting one or more designs. In the end, the client chooses the design they like best.
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thanks for the rating and the advices, here you are an edit version of the icons, I hope it will be better.
On the right track to me. The "3d" effect is hardly noticeable and not wanted. The used lines may be a bit more "fat".

Hi,
here you are! I hope you like it!
For any request do not hesitate to contact me.
Have a good day!
Guido.
This is starting to look good. Though if details are too small it is unclear what it is (the xenon for example starts to look like a rocket, also it is not clear from the icon it is xenon). Check for yourself, the icons as attached do not have this issue in that extend.