You chose nice painting scheme, it will look good on table. Although I heard painting black is actually pretty challenging
It looks good, I wonder how will you apply this scheme to non-vehicles, might be interesting to see.
And of course you need more practice, but I will not really judge your skill. With each model it will look better and better - that how it was for me.
General painting tips:
- use wet palette - this is actually one of the better tricks I learned. It's also very easy to make:
You take a small dish, or plastic box, or anything that can hold 1mm of water. Now take a paper towel or tissue, fold it so it's about 10cm x 10 cm (I guess 4 inch if you're US) and then wet it. Once you have it wet, cover it with baking paper. Baking Paper will not get wet itself, but it slightly porous, so it will let small amount of moisture through.
Now once you have this wet palette, use it for painting - take a drop or two of paint, drop it on palette, and use it. If you want it's easy to mix it with other colors and you can also easily water it down if needed. And it stays wet thanks to moisture from below, so it will not dry up quickly. It's really a wonderful tool
There are tons of movies on youtube how to make wet palette, here's a good one: https://www.youtube.com/watch?v=96mjmqWTPfM
- learn to drybrush - this is very easy, and gives good effect at the beginning. I used it to paint edges at start, because wet painting requires surer hand and much better control - this is also a good skill to get but it will come with time.
Also drybrushing is very useful later once you start learning to highlight. As highlight is basically doing the same as drybrush just with more control on the effect, when you start learning it, you will have this image in your mind - "how it would look like if I drybrush it" and then do the same with highlight.
- edge painting - what I learned when painting my necrons was to use more colors to paint each edge. As an example - I usually paint my necrons with Ushabti bone color, and I edge it with white mixed with a bit of it (to not get too bright white). But I learned it looks better if first I will paint all edges with 2mm Screaming skull (watered down 1:1) - this gives much smother transition from Ushabti Bone to White highlight and looks much better. There is great example on how edge painting might look here: http://taleofpainters.blogspot.com/search/label/Necrons
The guy there, when he's painting his transition from black to red, is using I think 3 different shades of red. And it looks really good. But this of course requires a lot of time and practice.
- watch how other people paint, what kind of techniques they use, how they apply color. It's really entertaining and gives you good ideas for future. I love those two sites for it:http://taleofpainters.blogspot.com/
They actually produce great step by step guides how to paint miniatures - I love those.http://www.dakkadakka.com/
showcasing various painted warhammer miniatures - great place to watch daily