The recommended size for a Steam profile picture is 184 x 184 pixels. However, the image is displayed at a smaller size, so it's best to use a square image for optimal appearance. Additionally, the maximum file size allowed for profile pictures is 2 MB, and the accepted formats include JPG, PNG, and GIF.
You can't, I'm pretty sure.
You can upload a picture of any size and Twitter will automatically resize it.
To change your profile picture on YouNow, log in to your account and navigate to your profile page. Click on the current profile picture or the edit icon, then select a new image from your device. After choosing the desired photo, save the changes to update your profile picture. Make sure the image meets YouNow's size and format requirements.
mine is 3inches to 5 inches
No
Save it and then upload it as your profile picture.
Tag Yourself In The Picture And Then Go On Your Profile Then Go On The Pic And Go Down Then It Should Say 'Make This My Profile Picture'
To change your profile picture on wikianswers go to your profile and upload it from there.
To change your color profile picture on Facebook, go to your profile, click on your current profile picture, select "Update Profile Picture," choose "Add Frame," search for a color frame you like, and then click "Use as Profile Picture" to save the change.
Short description of your profile picture
To change your profile avatar in Steam, open the Steam client and go to your profile by clicking on your username at the top. Select "Edit Profile" and then navigate to the "Avatar" section. You can choose from the available Steam avatars or upload a custom image by clicking on "Upload your avatar." Save your changes, and your new avatar will be displayed on your profile.
You have to download the picture first. After this step you have to know the path of the picture. It then can be uploaded into the profile.