Pretty interesting avatars and signs, have some suggestions tho, try to use more borders to emphasize both ava and signs, this will make the image prettier and differentiate it from the background, that is mostly white.
Will also recommend using some sharpen and to watch out for resizes, sometimes its better to have a bigger and concentrated crop but proportional, than to make the crop smaller and to force a larger resize (usually width larger than height) which causes a blur, distortion and noise
For the last but not least, try to match the colours of the text's with the image, and to choose a proper font, larger fonts on osu! signs usually are somewhat ugly, because of the height limit (150px)
Anyways, great work on these, will ask for one soon!~