JPEG should only be used for photos. PNG is a more appropriate format for digital drawings. It's actually really obvious that you've saved it in JPEG. The image quality is very poor. You upload PNG images the very same way you upload JPEG files. There shouldn't be any complications.
You should save like this:
- Do NOT flatten the image. That doesn't let you edit it.
- Go to file and choose save as (not save)
- Then select PNG from the number of file formats you can choose from.
- Click 'save'. Nothing too difficult with that.
- I'll give you an option to do something random afterwards, I haven't really put in the effort to find out what that was. Just click yes (or whatever, I can't remember what that thing says) xD
You should not have any complications with uploading. If you did, you probably did something wrong. In dA it should work, almost all my pictures are uploaded as PNGs.
Aside from that, I'd like to say that layers aren't a hard concept to grasp. It's basically the idea that a la
yer 'above' another la
yer should be just that the image created on that la
yer should be 'on top' of the image created on a lower la
yer. It's really not something that you can say 'I'm just not completely experienced with them' with. The only hard part I suppose are the la
yer functions, but you don't need those for creating art. Use layers, it's important. I'm still unconvinced that you even tried to use them.