This is exactly the one I just finished! Seems we're going at the same rate! Welcome aboard!
The castle pic seems it could have used a bit of adjustments on the color to match the background, though the proportions seem about right. I was going to mention it seems to need a bridge at the entrance, but then I noticed the original one ALSO doesn't have a bridge!
Your alien ended up very well done. kept messing up the finer lines, but especially the mouth and nose turned out really nice. You even adjusted the neck to make it better!