according to my art teachers and few other artistic peers i know, if your drawing has wrong perspective, it's very hard to look at. No matter how well the design looks, without the correct foundations, the image is corrupt.
Here's something that should help..
Allan Macdonald - Quick Sketch Technique
What i can tell you is that, if you want to draw a car, your lines got to be smooth, the linework in general is like bent and jagged. If you want your lines to be more organic and smooth, you got to be confident in yourself. Draw out the lines fast, but do it lightly. with enough practice this becomes much easier.
Try not to smudge your work as a form of shading, because this blurs your picture, lowers the contrast of the work, thus becoming less sharp and outstanding. If you can't blend well with your pencil, there are many alternative ways to show depth. For example,
hatching and
pointilism, if you have time go google what these two are.
I see you tried to do a widebody because i can see your trying to show the wheel archs converging out. As a beginner - you are still a newbie right? - i recommend you stay away from widebody wheel arches because those are a bit tricky, even for me. the image post above yours was mine and you can see i'm avoiding it for now. With enough practice find a picture of a car that has wheel arches like the ones your drew and try it out.
the door is extremely small, I'm not going to bother to ask you how you managed to do that.
the Spokes of the rim don't even touch the outer lip of the rim, and your tires are blown out.
the roof shouldn't be that visible at this ideal angle you have. If you have trouble doing parts like this, i suggest you look at more pictures of cars at the ideal angle so you can get a better understanding as to why it looks like that.
I personally have trouble drawing a 3/4 front, bird's eye view of an MR car, because the roof sit relatively low and the widebody lines meet up wit the roof so it always looks awkward.
You mentioned something about wheel design? Well basically, you come up with an idea. that's it, anything goes, but i think your real question was
how to make the rims look good, correct? Not everyone gets rim perfect dead on, i have trouble drawing it sometimes myself (at specific angles).
Wheel Rendering - Allan Macdonald
That's photoshop stuff, but i learned how to draw rims much better on paper from this. the spacing of the spokes is essential in drawing a rim, it's like perspective. First of all we know that a circle consists of 360 degrees (deg.). Got it? Simply in your case, you have 6 spokes, divide 360 by 6. the dividend is 60 deg. This means that the space between the first and the 2nd spoke is 60 deg. as well for the other spokes. once you have that kind of an idea down, you can better picture what a 6-spoker rim should look like.
If your still lost, try it out on paper. quickly draw out a Circle, then lightly, make ticks which'll represent the center of each spoke. Look at it afterwards to see if the spacing all around is the same. Turn the paper clockwise or upside-down , then look at it and see if anything's wrong. I say to look at the work in a different perspective because the artist themself may not always be able to identify their own mistakes. By flipping it around (usually flipping it horizontally), you see the image in a completely differnt way, and thus means flaws can be pointed out in ways which the normal view wouldn't have done.
Hope you use this mini-essay as a future reference.. Go forth and Practice, EnJoy:tup: