Hey, sorry for taking so long, I'm afraid I've been a little bussy.
I believe it says this because you're trying to turn an url (which, turns into a dA page) into an image, which you can't do.
You were right, I did it wrong. Unfortunately, the pictures are too big, so I can't put them in here like that. From now on, I'll just save a little version so I can upload it here.
@Sad Memories C-C Doodle
I like this one. Although, the contrast is too little (I've read to keep it all balanced, which helps by looking at a histogram in PS?) and I don't quite like the shading brush you used, but I like his face+facial expression.
You're right, and someone actually pointed it out. I have another version with more contrast, which I'll upload right away so you can compare.
@Concept design for... something I don't even remember.
This has a lot more form compared to Sprite of a character for a personal project.
You're right again... Hmm... I think it's because the sprite doesn't have a designed lightsource. Do you think I should add it? I need more practise with this kind of drawing...
@Perspective practice with Photoshop.
Looks kinda wonky to me (I don't know why though, so can't help you there, since I'm really bad at perspective myself, haha). Just pointing it out.
Perhaps that's because the perspective itself is weird (I tried it to be like that). But I'm also not that good with technical drawing, so if anyone else has something to say about it...
And... I'm not sure about the "practice" word xD My English is a little broken, so sorry if I miss a few words.
That said, I'm posting a new painting and Sad Memories with changes.