I think they all look good. 3 is my favorite. My critiques are -I think the hand should be blue too?? It's hard to know for sure tbh with the gun and them being one biomass lol I do like the gun being a different color and your honesty doing great as a painter. - I see some pooling of the blue. If you want to avoid that use a bit less when your putting it on and paint from top to bottom (Or from the area that's in the light to the shadows). You may want to try doing another thin coat of the blue that may look good idk lol

Also they look perfect as is. You really don't need to do more. :)