Just as general feedback, which I'm sure others may wish to also add their 2 cents into.
I would like more customisability with the Army Painter tool; you just need to look at games like Fallout 4 for example, you can pretty much colour or amend every body part. In tandem with this I would also like the ability to heavily customise each individual part on each individual units colours.
I'm not sure if you can add your own army badge? I think you should also be able to do that - likewise with the online Profile picture, I would like extra customisability with that. For instance, having 40K armies pictures there, or generic profile pictures like an Imperial Guardsmen, or 40K stars/ universe or something.
I think you should provide more colours, either in a RGB or HSI model, it seems a bit random atm; it's a good start don't get me wrong, but I think appearance is important, this kind of thing keeps me personally attached to the game and makes me want to keep playing it