There might be some good books there, but if I see a cover that looks slapped together, I'm going to think that the book inside the cover is slapped together. I could be wrong, and I could be missing a good book. But the odds are that I am not. A good cover won't make me buy the book, but it might get me to read the blurb. If the blurb is good, I might read the sample, and if the sample is good, then I might buy the book.
A cover probably shouldn't look like it was drawn by a child. It shouldn't have too much on it, probably should be fairly simple. There's the one cover "Come and Talk to Me" it isn't too bad, but the Coast Guard ship probably shouldn't be there in the first place, let alone be badly photoshopped. Some of the art would have been considered acceptable cover art in the decades ago, but that cover art isn't highly regarded now.
If you're not really good at drawing, it probably is best that you don't draw your own book cover. Good enough for little doodles isn't good enough for a book cover. I couldn't draw to save my life.