Right, so img #1 that I can see (the editing of the shirt), the colours are not actually half bad.
img #2 (spinny girl). Never JPEG a graphics file like this, they should only be used for photos from cameras. Anyway it wasn't hard to do, just get the 8 angles of a habbo from an imager and stick it into a animator creator-like thing.
and the final image (the other graphic you designed), well, it's ugly. The colours are not nice to the eye and the trousers go around the leg the wrong way, it looks weird and 2D, The shirt on the arm also looks 2D as it does not look like it is going around the arm.
Sorry but the trousers have an awful pattern with what appears to be no shading. The winking eye should be black too, and not looking like he just had a stroke which only affects the eye (somehow). The hair is awful though, never mind the resemblance to Jedward, it's not isometric and the shading on it is quite bad, but it's the lack of isometric angling which utterly ruins it.
Like I said in the other threads, take a step back.