Consider to keep response on topic and related to the thread. As for the OP i would consider reducing the blocky approach as it’s quite simple and simplistic depending on what approach your wanting to go for.
I’m assuming your referring to a cartoony build if so the color is a bit off, low poly builds normally strive for more vibrant brighter colors. Try including more variety of shapes and possibly some text in the front make it more natural i’ll try to follow reference images to get a overall good approach as shapes and color pallets.
For cartoony builds aim for warm, vibrant colors, add something in the background maybe some trees or a football field so on and so forth, you could get some ideas in some images to get the full detail or look at existing builds and see what kind of color scheme they have small objects could improve the overall design. Otherwise my small recommendation would be try improving certain areas