To begin, the artist asked "would like to hear from you how I can improve speedpainting". I answer in saying while the idea and style are very popular today as a work habit and an exercise you needn't be concerned with speedpainting as a goal. JUST DRAW. When we sit down with certain goals in mind sometimes they help, sometimes they strain the creativity. I feel it's less important to care about getting into a speedpainting group and more important to Just draw and create a good piece of composition. Having said that, onto your critique...
The cityscape of the future is one that is often done but there is a simplicity to this one that draws us in.
All the viewpoints and perspective seem accurate and the dutch angle also adds a nice dynamic that's interesting and different from a lot of atmospheric perspective pieces.
The tower of Babel set in a futuristic world definitely puts our minds in a whole new place when thinking of the humans attempting to build a tower to heaven. There's a great light on this tower that draws the eye to a good area of focus and leads us up out of the frame only to circle round again with the bridge on the upper left and then follow the flying vehicle back towards the city. A very good read for composition, definitely one that draws you in and keeps you there for a moment. Good work.
This feel a bit like something I see Feng do, just in the way the lower parts of the city and the shapes in general look. I like the slightly snake like effect of the white street how they weave through into the main building.
Tower of Babel, whose top would reach into the heavens! i love the idea of sci-fi humans building a similar structure, but in my imagination it looks like a weapon. The speed painting is impeccable I've had this crazy idea for a story where the Tower everyone thought was actually a weapon, and it's target was Heaven (Either way it's regarded as impossible). Some Idea huh
I find this painting of a tower in the future fairly intriguing. Mainly because of that out-of-place mass of light at the bottom of the tower. It gives me the impression that somebody has set off a bomb down there.