CCP_Leonidas

Are you playing the game on Windows or macOS?

Yes. If you have another stackable window open (for example, EveMail) you can drag the character sheet onto the other window to stack it again. If this isn’t working, ensure you’re clicking and dragging the character sheet header to the right of the character portrait (if it’s dragged using the character portrait header, the window won’t stack).

Unfortunately, we currently don’t support Wine on M1.
There is a thread here (which you may already be aware of) where this topic has been discussed:

What macOS version are you currently running?

This looks like the game may be using the Low or Medium Character Texture Quality setting.

If you press Esc, navigate to the ‘Display & Graphics’ tab, and look at the ‘Character Display Settings’ section (found in the bottom-center panel), what setting do you see for Character ‘Texture Quality’?

If that is set to Low or Medium, try changing it to High and that should improve the quality of the clothing textures.

It looks like the Character Sheet is stacked, but the other stacked windows have been closed.

If you click and drag the ‘Character Sheet’ tab to another location and release the mouse button, does the character portrait work again?