This is looking nice so far. You have really fanciful, interesting aliens in a greeat setting. And you have a whole lot of bright vibrant colors, everywhere. There’s little break anywhere from the colors, and every single part of the canvas is equally intense, all fighting for the eye’s attention. It makes it hard for the eyes to rest anywhere, or help from being pulled somewhere else. One thing that could help your composition is to vary the values and saturation levels more: The table is obviously the main focal point so what if it were the most intensely colored thing on the page and other less important areas (like the sky) were less saturated and trying to grab your attention less? Or if you focused on having more warm hues in the foreground and cooler colors in the background? Or vise versa, to provide some warm/cool contrast between front and back?
Anyhow, just some ideas. Great work so far, and terrific details! 