1. The obvious problem here is that you haven't recolored every last pixel. That needs to be first if you're going to go and fuse. Otherwise it'll look messy and not consistent. Second is the haphazardly placed wings; they do not connect to the back at all and the one on our right is just melded into the shoulder, blocking off part of the arm. A good amount of the parts placed on the base aren't cleaned up well either. There are stray pixels around the head feathers and the arms. Go in and clean those up before you choose where to place them.
2. It's simpler, so easier to do. You still lack the recoloring though. Remember, the splice that you do only looks like its own Pokemon if you fuse all the parts cohesively. All the same color scheme, all the same parts, each blended together to look like it was supposed to be that way. Also, it's Infernape. Not Blaziken.
3. Once again, missed the recoloring. The right arm is wonky and for some reason still has the partial tail attached to it. You need to either use it in the sprite or just get rid of it. Cleaning up your parts is essential to making the sprite work. Another example is the crest: you didn't add those missing pixels when you removed it from Empoleon, so now it looks like it's incomplete. You also need to be sure to blend both sprites in a way that there is an even amount from both. Right now, it seems like it's just Emboar with Empoleon's arms, and it doesn't give the look of something new.
4. All of the aforementioned problems are located in this sprite. Lack of recolor, parts not cohesively added on, stray pixels, and a lack of cleaning up. Basically, everything said above should definitely be worked on with this one. Also, and I hope I don't offend, but the way the descriptions and everything else is written has me wondering if you actually are ten. Because it comes off as the stereotypical way a ten year old would type, with the random capitalization and rampant use of emoticons. Just an observation form me.
All in all, they aren't perfect, but they aren't beyond salvage. Just take the criticism that you receive and listen to it, ignore people that come and say "OMg, so epics!!!!1!!!11!" because it will not benefit you in the slightest. Keep at it, practice, and you'll get there in no time.