I don't have much advice being new to art myself, but I did just want to say I like a lot of your stuff. I think you have a great start, I especially liked the little reflection in the blue cabinet painting, gives it a real metallic feel imo.
Leonor, let's just say I'll work as hard as I can, and use this time as an opportunity to improve as much as possible. If I have to go back to my day job at the end of it, at least I'll be able to take my improved skills with me.
@Leonor I don't have a procedure as such, I'm not very confident with perspective yet. I've done a lot of practice where I use a photo of a bus/building or anything cube-like, and just draw the cube. I check if it's right by overlaying the photo on top. I normally keep a score, so if it's right I get a point, and if it's wrong I start another one.
If you do this, just be aware that the perspective depends on the lens the photo was taken with, so long lenses have less convergence than wide angle ones.
@SandyMan, thanks you're definitely right about the plane being flat, I will keep that in mind on the next one.
Some more cars (observation) another spaceship thumb and some super-exciting still life stuff:
Master studies (Leonardo & Mucha) and a bust study (photo) I did with a cheap tablet I found on ebay (motion LE1600, it's ok, but the minimum pressure to register a stroke is way higher than my intuos, I'm finding it pretty annoying atm).
Mucha does insane hands. I don't. More studies required.