I think your art is worth more than you are charging; you should charge more.
It is hard to raise prices when you are trying to get more customers. Really a balance you need to figure on your needs and how much time you put in them.

I agree with Naikelea on this one~ You can set them at whatever you feel your time is worth, test the waters for a bit, then go up or down based on climate. It's a delicate balancing act, and people will come and go no matter which way you go.

That's the main problem and that's why I asked this question, because I can't find the balance... Actually, I draw quite fast, I think, but nobody takes commisions now and that makes me feel scared because I'm afraid that my content isn't quality enough and the prices are too much for drawings like mine and this way I think that if I'm raising the prices, then nobody will take commisions AT ALL. And this really stresses me because I have many needs but I don't have money even for my daily necessity like buying bread or something like that

hmm I was looking around, if there's somewhere that is not updated, people might be confused and think you're still busy working on other comissions.
That's what I did tought about when I saw your profile right now.

Oooh, I see... but I thought that I'll do my emergency commisions first (like I did with my last chibi commision) and then return to drawing old commisions because they were ordered on sale. Hm.

Sometimes it isn't the price but the style or the material. Themes like Pokemon or MLP tend to be more popular and get more viewers.

Hm, that's an interesting idea. I wonder if I can draw them or not...

based On the effort on them I think you should go with this
lline art, - 5$
line art and color, - 10$
line art and color and shading - 20$ That's the idea I had for the time

if I ever got commissions I'd probably use the same formula

Also Naikelea has a good point on that too!

Hm... I use almost the same formula to set prices for my russian subscribers!