well, my overall for you would be 21, but wanting 20 before you start a shop is low as you have 5 images, you'd only need an average of 4 per picture.
Rainbow lugia: 2
Evil Milotic: 3
Lugia raquaza fusion: 3
Pink Salamence: 7
Trainer Card: 6
Rainbow Lugia: to bitty, the colours don't go well together and overally looks terrible
Milotic: Also a bit bitty, but it's to dark, you can't see its design properly
Lugia: Colouring's pretty bad, also the pictures been saved as another type before you saved it as PNG.
All of those i would suggest doing again, the salamence however is very good, although i tend to like an outline(that's just personal preferance). Also the Trainer Card is simplistic, which is sometimes good if you're giving it a first try
Overall, work on the first 3 and try and get them as a better quality.
Remember, if i'm mean, it's only because i love all of those little pokemon