Right. First of all, the quality of Butterfree is very poor. What file are you saving it as? PNG is the best option.
Next up: Charizard. Not too bad. Pay attention to the outline though. This is important. On Pokemon spirits even the outline is shaded. See all that red around it? You should change that to dark blue. On Blastoise that would be found on the outline, paricularly on the bottom and right.
As for Ganglax, well, you can see that it is poorly done right? This is partly because you chose some fairly incompatable sprites to fuse. Try using Porygon-Z next time. He is one of the easiest Pokemon to fuse if you make him the base.
One other reason that that sprite isn't too good is that you tried too much too soon. To cut that much or Gengar requires a fair amount of knowledge of scratchg work which you will only get after time spent spriting. Can't you see the lack of outline on Gengar there and how diffrent it is to Snorlax?
In addition, the red you used for the belly conflicts violently with the purple from Gengar. I told you to use subdued tones, yes? Well the red which you seem to have taken from the eyes is too bright for that much use. After a while you will learn when to use such bright colours but for now keep them dull.
Now for me to issue you some homework:
1. Recolour some not too complicated sprites using the colours of other sprites. If the number of shades for each colour does not match, then use a diffrent Pokemon. Pay acrefull attention to the outlines too.
2. When you feel confident with how the basic colour system works, recolour a Pokemon using your own custom colours. To make your own custom colours, if you do not know, is to double click on a present colour which will bring ap a box. Click the button to expend the box and chose a colour on the square halfway up. First find your basic colour. This should be the colour that is not a highlight or shading. Try to match the shade that you are replacing until you get more experianced. Put the colour under the corrosponding colour for the sprite that you had extracted as I showed you. Repeat for each shade. To change the shade, use the bar next to the box.
Okay?
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Now, Psycho Trainer. Never use a black background. It makes the outline hard to fix if you ever want to change the background colour. Also a black background is never the best way to display a sprite. Just look at his toe nails! They only exist as white dots.
The same outline advice that I gave to Weavile Tamer applies to you too. You should also try the tasks I suggested for him to do.
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It may seem like I was a little harsh with my critisisms. Don't worry. The two of you are new two this. Keep trying and you will get better. Trogdor, for example, has not been here long and he has gotten much better. He still has quite a way to go but so do we all. I look forward to you posting some great work of your own in the near future.