Hello LightYagami123. Not bad, but I think with enough practice, you'll become a pro.I like the second one more than the first one.
I'm no expert, but I do have a few tips that may help.
1. If you don't do this already, try making a character bio that with every character you create,(maybe overboard...maybe every character with a role) with all of their traits, specifically their personality. This way, you have a solid foundation of your character. The next thing now is to put the foundation into work.
2. Next its finding your voice. There are too many ways to do this... but its fun figuring out doing it ya know? Try to micmick someone, make your own unique voice, or even hire someone (which would make these tips pointless if you wanna work on your voice work). Using your regular voice works as well. In fact, I think you should do that first, and I'll explain why later. Also, between us, its okay to "cheat" ;p. If there is a certain tone you cannot reach, its okay to use some sort of voice altering software to get the voice you'd like. I use Morphvox pro for female voices, or monster like voices. That being said, its still good to trying it out first without the alterations.
3. The latter and this tip is relative to each other. In fact, all of them all of them are but these 2 specifically. This is where the personality/emotional part comes into play. The funny thing about this one is this tip came from my job that had NOTHING to do with with voice acting. I wrote these down to help me with voice acting...
Here are the notes:
"How we use our voice often say more than words we choose. What aspects of our voice can we use to show meaning or emotion?"
They are;
*tone/ intonation
*Pitch
*Volume
*Speed
*Phonemes
*Word stress
*sentence stress
"note:( to self) remember this for voice acting

"
(end note)
Now I would use my normal voice first when I do this. If not sure how to do a certain emotion, put yourself in your characters shoes and be like "now how would feel if _______" Do it until you find the way that works for you then apply your character voices. Try not to over think this step. The whole emotional thing...It's something that you do everyday!
4. The Final thing I forgot to mention is the quality of the audio. You want that noisy static to be non existant, or so quite it won't be heard. I recommend using something like audacity (free) to get rid of that. Also, it may be a good idea to either normalize your audio, or add a compressor...or maybe both. Experiment with it =).
Well I hope this helps.